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Midterm 2

Roseanne Jones 182 preguntas

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Preguntas del test (182)

1 The simplest reflector telescope design is the prime focus reflector.
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2Galileo is credited with designing the first reflector telescope.
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3Chromatic aberration affects reflector telescopes.
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4All optical telescopes will bring the light from a star to a focus.
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5A telescope design that uses a lens and no mirrors is a refractor.
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6 CCD detectors gather light 10-20 times faster than the most sensitive photographic film.
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7A Newtonian reflector needs no secondary mirror.
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8The Hubble Space Telescope gives us its best resolution with X-rays.
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9The Cassegrain reflector needs a primary concave main mirror and a smaller, convex secondary mirror to reflect light back through a hole in the primary.
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10Photography with film is still the preferred way of capturing fine detail in the faintest, most distant galaxies.
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11The light-gathering ability of a telescope is most dependent on the diameter of its primary objective.
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12Mt. Palomarʹs 200ʺ Hale telescope is the largest reflector now in service.
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13 A telescope with an 8-inch mirror will collect twice as much light as one with a 4-inch mirror.
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14 The 400ʺ Keck reflector can see objects 100 times fainter than the 40ʺ Yerkes lens.
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15Radio telescopes have poorer angular resolution than optical telescopes because radio waves have a much longer wavelength than optical waves.
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16All modern large optical telescopes are refractors.
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17Stars do not twinkle; the instability of the atmosphere causes this effect.
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18The opacity of the atmosphere is partially corrected via adaptive optics.
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19In the future, adaptive optics will greatly enhance the resolution of the Hubble Space
Telescope.
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20Optical telescopes are usually used only at night, but radio telescopes can be used day or night.
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21The Earthʹs atmosphere is the major factor limiting the use of ground-based radio telescopes.
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22Optical interferometry is more in use than radio interferometry.
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23
Radio astronomy can only be done from up in space, due to our ionosphere.
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24Like radio and optical astronomy, infrared astronomy is easily done with ground-based telescopes.
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25Due to our ozone layer, ultraviolet astronomy must be done from space.
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26The mirrors for X-ray telescopes are the same shape as those of optical reflectors.
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27The Compton GRO was the first telescope used for our exploration of high-energy astronomy.
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28Galaxies look the same whether viewed in visible or X-ray wavelengths.
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29All the terrestrial planets lie inside the asteroid belt.
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30Plutoʹs orbit has a lower inclination to the ecliptic than any planet.
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31One characteristic of the terrestrial planets is their extensive moon systems.
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32All the planetʹs orbits are evenly spaced.
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33Earth is nearly twice as large as Venus.
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34All the planets revolve around the Sun in the same direction, except for Venus and Uranus.
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35All the planets orbit the Sun in exactly the same plane as the Earth.
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36The two smallest planets, Mercury and Pluto, have no moons.
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37All four jovian planets are thought to have cores larger than Earth.
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38All jovian planets have rings around their equators and at least eight moons.
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39 Pluto is more similar to the jovian planetʹs icy moons than to any of the other planets.
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40Due to their great masses, all four jovian worlds are much denser than the Earth.
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41A Kuiper Belt object was discovered that may be larger than Pluto
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42Barringer Crater in Arizona is an example of a meteorite impact.
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43 Most astronomers now believe the demise of the dinosaurs 65 million years ago was caused by a large asteroid impacting the Yucatan peninsula area.
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44Meteor showers are the result of collisions between asteroids.
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45Carbonaceous asteroids contain fragile organic molecules.
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46Many astronomers now regard Pluto as just one of the largest of the thousands of Kuiper Belt bodies found beyond Neptune.
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47 Cometary dust tails lag behind the bluish ion tails as the comet rounds the Sun.
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48 Comets are not actually members of the solar system, but have been captured by the Sun.
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49 The Oort Cloud lies closer to the Sun than the Kuiper Belt.
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50 Researchers estimate that there is more total mass in the Kuiper Belt than in the asteroid belt.
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51Some meteorites are believed to have come from Mars and the Moon.
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52 As a rotating gas cloud contracts, it spins faster.
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53In the solar nebular theory, the dusty disk condensing around the Sunʹs equator became the ecliptic plane in which the planets then formed.
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54In addition to revolving around the Sun counter clockwise, most planets also rotate on their axis counter clockwise.
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55Any successful model for the formation of the solar system must explain why the orbits of the planets have low eccentricities.
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56Astronomers have not yet been able to detect planets outside our solar system.
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57We would expect other planets beyond our own solar system to orbit the equators of their home stars, as our own planets orbit the Sun.
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58 In some cases, we have seen extrasolar planets pass in front of their stars.
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59No stars have yet been observed that have more than one exoplanet.
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60The Kepler spacecraft has already identified thousands of exoplanet candidates.
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61 The fact that we donʹt see very many Earthlike planets in orbit around other stars is an indication that Earthlike planets are rare.
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62Which type of telescope has the simplest light path?
1. Aprime focus reflector
2. Bsingle lens refractor
3. Cachromatic refractor
4. Dnewtonian reflector
5. Ecassegrain reflector
63Which of the following is NOT a reason to use a reflecting telescope rather than a refractor?
1. ALenses are subject to chromatic aberration.
2. BLenses are harder to focus than mirrors
3. CLenses absorb light, while mirrors do not.
4. DHeavy lenses, which can only be supported at their edges, tend to deform under their
  own weight.
5. EA lens must have two precision surfaces; a mirror needs only one.
64What problem do refractor telescopes have that reflectors donʹt?
1. Adiffraction limited resolution
2. Blight loss from secondary elements
3. Cchromatic aberration
4. Datmospheric blurring
5. Ebad seeing
65 The most important advantage of CCDs over film is that
1. Athey record much more light in a given exposure time.
2. Btheir images do not have to be developed as film does.
3. Cthey record colors better than film can.
4. Dthey can cover larger areas of the sky than film can.
5. Etheir images never fade, as film can.
66The primary purpose of a telescope is to
1. Acollect a large amount of light and bring it into focus
2. Bmagnify distant objects.
3. Cseparate light into its component wavelengths.
4. Dmake distant objects appear nearby.
5. Emeasure the brightness of stars very accurately.
67A major advantage of a Newtonian reflector over a refractor is
1. Athe elimination of chromatic abberation
2. Bits compact size.
3. Cthere are only two lenses to grind.
4. Dthe central hole in the mirror is smaller.
5. Ethe elimination of the secondary mirror.
68Adding a secondary concave lens of carefully chosen different glass to the primary lens on a refractor allows
1. AX-rays to be focused.
2. Bchromatic aberration to be reduced.
3. Ceffects of atmospheric turbulence to be reduced.
4. Dgreater magnification.
5. Emore light to be gathered.
69 It is diffraction that limits the ________ of a telescope of a given objective diameter.
1. Amagnification
2. Blight grasp
3. Cresolution
4. Daperture
5. Einterference
70The angular resolution of an 8 inch diameter telescope is ________ times greater than that of a 2 inch diameter telescope.
1. A2
2. B4
3. C8
4. D9
5. E16
71 The amount of diffraction and thus the resolution of the telescope depends upon
1. Athe wavelength used and the size of the main telescope objective lens or mirror
2. Bthe design of the telescope.
3. Cwhether the telescope is a reflector or refractor.
4. Dthe brightness of the object.
5. Ethe size and sensitivity of the CCD chip used for imaging.
72What is the resolution of a telescope?
1. Aits ability to see very faint objects
2. Bits ability to distinguish two adjacent objects close together in the sky
3. Cits ability to make distant objects appear much closer to us
4. Dits ability to separate light into its component colors for analysis
5. Eits ability to focus more than just visible light for imaging
73Compared to a 5 inch prime focus reflector, a 5 inch Newtonian reflector will
1. Ahave more light gathering power.
2. Bhave the same light gathering power.
3. Cbe easier to build.
4. Dhave more chromatic aberration.
5. Ehave a larger hole in the center of its mirror.
74What is the light-gathering power of an 8 inch telescope compared to a 4 inch telescope?
1. A2 times better
2. B4 times better
3. C8 times better
4. D16 times better
5. E32 times better
75Green light has a shorter wavelength than orange light. In a 5 inch telescope, green light will
1. Aprovide better angular resolation than orange light
2. Bcome to the same exact focus as orange light.
3. Cprovide worse angular resolution than orange light.
4. Dallow dimmer stars to be observed.
5. Ereduce the effects of atmospheric turbulence.
76What problem does adaptive optics correct?
1. Adefects in the optics of the telescope, such as the original Hubble mirror
2. Bthe opacity of the Earthʹs atmosphere to some wavelengths of light
3. Cthe light pollution of urban areas
4. Dthe turbulence in the Earth's atmosphere that creates twinkling
5. Echromatic aberration due to use of only a single lens objective
77What is true of radio telescopes?
1. AThey have poorer angular resolation than a refractor of the same size.
2. BThey have better angular resolution than a reflector.
3. CThey are the smallest, most compact telescopes.
4. DThey can only be used above the atmosphere.
5. EThey are most sensitive to the opacity of the ozone layer.
78The Arecibo radio telescope is laid out like which optical telescope design?
1. Aprime focus reflector
2. BNewtonian reflector
3. CCassegrain reflector
4. DCoude reflector
5. Egrazing incidence reflector
79In astronomy, an interferometer can be used to
1. Ayield better seeing conditions with optical telescopes.
2. Bdecrease the effects of light pollution in getting darker sky backgrounds.
3. Cimprove the angular resolution of radio telescopes
4. Dincrease the sensitivity of infrared telescopes to longer wavelengths.
5. Espeed up the processing of CCD images.
80Compared to optical telescopes, radio telescopes are built large because
1. Atheyʹre less expensive to make than optical telescopes.
2. Bradio waves have very long wavelengths.
3. Catmospheric turbulence is more of a problem.
4. Dradio sources are harder to find.
5. Eradio waves are absorbed by the atmosphere.
81One advantage of the Hubble Space telescope over ground based ones is that
1. Ait is larger than any Earth-based telescopes.
2. Bit can better focus X-ray images.
3. Cit can make better observations of the ozone layer.
4. Dits adaptive optics controls atmospheric blurring better.
5. Ein orbit, it can operate close to its diffraction limit at visible wavelengths.
82The design of modern X-ray telescopes depends on
1. Alenses made of germanium.
2. Bthe prime focus design, with mirrors made of iron.
3. Cgrazing incidence optics.
4. Dachromatic lenses to keep the X-rays in focus
5. Ethe Cassegrain design, with mirrors made of lead.
83Which of the following is currently supplying high resolution X-ray images from space?
1. AROSAT
2. BChandra
3. CEinstein
4. DHEAO-2
5. ECOBE
84The [blank_start]prime[blank_end] focus reflector needs only a single optical surface to form images.
1. Aprime
85An advantage a reflector has over a refractor is the elimination of [blank_start]chromatic aberration[blank_end].
1. Achromatic aberration
86Density is defined as
1. Amass per unit volume
2. Bweight per square inch.
3. Csize divided by weight.
4. Dmass times weight.
5. Eweight divided by the planet's radius.
87Which of the following are the jovian planets?
1. AJupiter, Saturn, Uranus, Neptune, and Pluto
2. Bonly Jupiter
3. Conly Jupiter and Saturn
4. DJupiter, Saturn, Uranus, and Neptune only
5. Eeverything past Mars and the asteroid belt
88Which planet by itself contains the majority of mass of all the planets?
1. AJupiter
2. BSaturn
3. Cthe Earth
4. DVenus
5. EUranus
89Planetary orbits
1. Aare evenly spaced throughout the solar system.
2. Bare highly inclined to the ecliptic.
3. Care almost circular, with low eccentricities
4. Dhave the Sun at their exact center.
5. Eare spaced more closely together as they get further from the Sun.
90Which of the following is not icy in composition?
1. Acomet nuclei
2. BKuiper Belt Objects
3. Cthe polar cap of Mars
4. Dasteroids
5. Emost jovian satellites
91What is true about solar system densities?
1. AIn differentiated bodies, the denser materials lie near their surfaces.
2. BThe denser planets lie closer to the Sun.
3. CThe asteroids all have about the same density.
4. DSaturn has the same density as water.
5. EPlanetary density increases with increasing distance from the Sun.
92 The jovian planets
1. Aall lie less than 5 AU from the Sun.
2. Ball have rings around their equators
3. Call spin slower than the Earth.
4. Dhave satellite systems with less than 4 moons.
5. Eare all much more dense than any of the terrestrial planets.
93The largest asteroid, and probably the only one to be a spherical ʺworldʺ is
1. AEros
2. BIda
3. CVesta
4. DCeres
5. EGaspra
94The Kuiper Belt is found where in the solar system?
1. Abeyond the orbit of Neptune
2. Bamong the orbits of the terrestrial planets
3. Cbetween the orbits of Mars and Jupiter
4. Dbetween the orbits of Jupiter and Uranus
5. Esixty degrees ahead or behind Jupiter
95The tail of a comet always points
1. Atoward the Sun and disappears at perihelion.
2. Btoward Earth and never varies.
3. Caway from the Sun and disappears at perihelion.
4. Daway from the Sun and becomes longest and brightest at perihelion.
5. Ein the direction of the cometʹs motion.
96The Oort Cloud is believed to be
1. Aa flattened belt of cometary nuclei just beyond the orbit of Neptune.
2. Bthe circular disk of gas around the Sunʹs equator from which the planets formed.
3. Ca grouping of asteroids and meteoroids between the orbits of Mars and Jupiter.
4. Da spherical cloud of cometary nuclei far beyond the Kuiper Belt.
5. Ethe great nebula found just below the belt stars of Orion.
97Which of the following does not fall into the category of interplanetary debris?
1. Acomets
2. Bmeteoroids
3. Crings around the jovian planets.
4. DTrojan asteroids
5. EKuiper Belt bodies
98Which of the following have an icy composition?
1. Amost asteroids
2. Bmeteoroids
3. Ccomets
4. Dthe surface of Mars
5. Emeteorites and most asteroids
99The Trojan asteroids are found
1. Aorbiting around the Kuiper Belt body Hector.
2. Bwith the others, between Mars and Jupiter; their red color gives them their name.
3. Csixty degrees ahead or behind Jupiter, sharing its orbit about the Sun.
4. Dbeyond Neptune, with orbits similar to Plutoʹs.
5. Ecloser on average to the Sun than is the Earth.
100 The most distant objects in our solar system are
1. Ain the Kuiper Belt.
2. Bthe jovians.
3. Cin the Oort Cloud.
4. Dshort period comets.
5. Ethe Trojan asteroids.
101The first spacecraft to land on the surface of an asteroid was named
1. AStardust
2. BGiotto
3. CNEAR
102Which statement about asteroids is not true?
1. AThey vary considerably in composition, reflectivity, and size.
2. BMost stay between the orbits of Mars and Jupiter.
3. CSome have satellites of their own.
4. DTheir images become blurry due to outgassing as the Sun heats them up.
5. EEarthgrazers can cross not only our orbit, but even those of Venus and Mercury.
103The most detailed look weʹve had of an asteroid comes from
1. Aspacecraft sent to an asteroid.
2. Bground based optical images.
3. CEarth orbital X-ray images.
4. Dground based radar images.
5. Ehigh-altitude UV spectroscopy.
104 Before it arrived in orbit about Eros, the NEAR spacecraft visited
1. AVenus.
2. Bthe Moon.
3. CMars.
4. Dthe asteroid Mathilde.
5. Ethe asteroid Gaspra.
105In July 2011, the Dawn probe entered orbit around
1. Athe asteroid Ceres
2. Bthe asteroid Vesta.
3. Cthe comet Wild.
106Relative to the comet, the direction of the ion tail tells us
1. Awhere the ecliptic is.
2. Bthe direction of the Sun.
3. Cthe velocity of the comet.
4. Dthe direction the comet is traveling.
5. Ewhere the comet came from.
107 Iron meteorites are believed to come from
1. Athe core of a differentiated asteroid, now broken up.
2. Bthe crust of a differentiated asteroid, now broken up.
3. Ca broken up cometary nucleus.
4. Ddebris from the Kuiper Belt.
5. Einterstellar space.
108Meteor showers are
1. Ausually annual events, as the orbits again intersect.
2. Bcaused by the Earth passing near the orbit of an Earthgrazing asteroid.
3. Ccaused by the Earth passing near the orbit of an old short-period comet.
4. DBoth A and B are correct.
5. EBoth A and C are correct.
109Meteorites are important because
1. Athey contain pristine material from the solar nebula.
2. Blarge ones may cause mass extinctions.
3. Csome come from the Moon and Mars, as well as the asteroid belt.
4. DAll of the above are true.
110A meteor is
1. Aa chunk of space debris that has struck the ground.
2. Ba streak of light in the atmosphere.
3. Can icy body with a long tail extending from it.
4. Da chunk of space debris orbiting the Earth.
111 A meteorite is
1. Aa chunk of space debris that has struck the ground.
2. Ba streak of light in the atmosphere.
3. Can icy body with a long tail extending from it.
4. Da chunk of space debris orbiting the Earth.
112Long-period comets are believed to originally come from
1. Athe asteroid belt.
2. Bthe Kuiper belt.
3. Cthe Oort cloud.
4. Dthe satellite system of Jupiter.
113The orbits of most comets
1. Aare like the planets, fairly circular and in the ecliptic plane.
2. Blie almost entirely beyond the orbit of Neptune.
3. Chave perihelions within the orbits of Mercury.
4. Dgo no farther out than Pluto, then return to the sun again.
5. Eare shorter than the 76-year period for Comet Halley.
114Objects in the Kuiper belt
1. Aare in random orbits at all inclinations to the ecliptic.
2. Blie beyond the orbit of Neptune, and close to the ecliptic.
3. Care the sources of long-period comets.
4. Dare dense, like the iron meteorites.
5. Elie beyond the orbit of Neptune and perpendicular to the ecliptic.
115Which of these bodies are most likely to break up over time?
1. Aasteroids in the main belt
2. Bjovian satellites
3. Ccomet nuclei
4. DKuiper Belt bodies
5. ETrojan asteroids
116The Manicouagan reservoir near Quebec is an example of
1. Aa volcanic event.
2. Bcometary debris.
3. CEarthʹs interaction with a cometʹs dust tail.
4. Da large meteorite impact.
5. Ea micrometeorite impact.
117 The nucleus of a comet is typically
1. Aa few meters in diameter.
2. Bvery durable, made of iron.
3. Ca few kilometers in size, and very low in density.
4. Da few hundred kilometers across, and bright, shiny white from its ices.
5. Elocated between the orbits of Mars and Jupiter.
118 Before it arrived in orbit about Jupiter, the Galileo spacecraft flew past
1. AComet Halley.
2. BMars.
3. CSaturn
4. Dthe asteroid Gaspra.
5. Ethe asteroid Ceres.
119If a cometʹs ion tail is pointing perpendicular to its direction of travel, the comet is
1. Aclose to or at perihelion.
2. Bclose to or at aphelion.
3. Cmoving closer to the Sun.
4. Dmoving away from the Sun.
5. EA cometʹs tail never points perpendicular to its motion.
120As the solar nebula contracts, it
1. Aflattens out into the ecliptic plane around the Sunʹs poles.
2. Bspins faster due to conservation of angular momentum.
3. Ccools due to condensation.
4. Dloses angular momentum.
5. Ereverses its direction of rotation.
121In terms of composition
1. Aall planets condensed from the same nebula, and have similar compositions.
2. Bthe jovian planets are more like the Sun than are the terrestrials.
3. Cthe terrestrials are more like the Sun, since they formed close to it.
4. Dthe Sun is unique, made of nothing but hydrogen and helium.
5. Ethe jovian planets are made only of ice, and the terrestrials only of rock.
122 According to the Solar Nebula theory, planets
1. Ashould be randomly oriented to their starʹs equator.
2. Bwill revolve opposite the starʹs rotation.
3. Cshould be a common result of star formation.
4. Dshould be extremely rare.
5. Eshould orbit perpendicular to their starʹs equator.
123As a rotating gas cloud contracts, it spins
1. Afaster due to an increase in angular momentum.
2. Bslower due to a decrease in angular momentum
3. Cat a constant rate.
4. Dfaster due to conservation of angular momentum.
5. Eslower due to conservation of angular momentum.
124The larger terrestrial planets have surface features that tend to be
1. Aolder.
2. Byounger.
3. Cmore cratered.
4. Dmore icy.
5. Emore rocky.
125 So far, beyond the solar system the extrasolar planets found have been mostly
1. Alarge jovians orbiting solar-type stars about where our jovians are found.
2. Blarge jovians very close to their star.
3. Cterrestrials very close to their star, and transiting its disk.
4. Dterrestrials with very elongated, distant orbits like comets.
5. Ebrown dwarfs much more massive than Jupiter.
126Most of the extrasolar planets found so far were detected by
1. Anoting the drop in the starʹs light as the planet transits its disk.
2. Bimaging them with the HST in the infrared, where they are easier to stop.
3. Cnoting the Doppler shifts of the star as the planet orbits it from side to side.
4. Dreceiving radio transmissions from them, much like Jupiter emits
5. Edetecting the oxygen in their atmospheres spectroscopically.
127Which statement about extrasolar planets found to date is true?
1. AAll are terrestrials, comparable in size to Earth.
2. BFew are found by Doppler shifts of their stars, due to their gravity.
3. CAll lie more than 2 AU from their star.
4. DMost have orbital periods of more than a year.
5. ESome are so close to their stars that their periods are just a few days.
128The number of confirmed extrasolar planets
1. Ais about 600, and is not expected to rise very much.
2. Bhas been decreasing as some observations thought to be planets have been disproven
3. Cis about 800, and is rising slowly, as observations are quite difficult.
4. Dwas about 800 at the time of publication but is rising rapidly due to new observations by
  the Kepler spacecraft.
5. Eis zero; there are observations thought to be of extrasolar planets but none has yet been
  confirmed.
129Planetary transits of exoplanets are rare because
1. Amost exoplanets are smaller than Pluto.
2. Bmost extrasolar systems are not seen edge-on.
3. Cour telescopes are not powerful enough to detect them.
4. Dmost stars are too bright for us to detect a planetary transit.
5. Ethe Earthʹs atmosphere interferes with our observations of transits.
130Exoplanets known as super-Earths
1. Ahave masses comparable to that of Jupiter.
2. Bhave masses comparable to that of Neptune.
3. Chave masses 2-10 times that of Earth.
4. Dorbit extremely massive stars.
5. Ehave yet to be observed.
131If a star was the same size as our Sun, but was 81times more luminous, it must be
1. Atwice as hot as our Sun.
2. Bthree times hotter than the Sun.
3. Cfour times hotter than the Sun.
4. Dnine times hotter than the Sun.
5. E81 times hotter than the Sun.
132The Sunʹs observed spectrum is
1. Aa continuum with no lines, as shown by the rainbow.
2. Ba continuum with emission lines.
3. Conly absorption lines on a black background.
4. Da continuum with absorption lines.
5. Eonly emission lines on a black background.
133The element first found in the Sunʹs spectrum, then on Earth 30 years later, is
1. Ahydrogen.
2. Bhelium
3. Csolarium.
4. Dtechnicum.
5. Ealuminum.
134A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains
1. Athe hotter gas.
2. Bthe cooler gas.
3. Cgas at the same temperature as the other jar.
4. Dthe exact same gas as the other jar.
5. Egas at very high pressure.
135 Which of these is emitted when an electron falls from a higher to lower orbital?
1. Aanother electron
2. Ba positron
3. Ca neutrino
4. Da photon
5. Ea graviton
136In Bohrʹs model of the atom, electrons
1. Aonly make transitions between orbits of specific energies.
2. Bare not confined to specific orbits.
3. Care spread uniformly through a large, positive mass.
4. Dcan be halfway between orbits.
5. Emove from one orbit to the next orbit in many small steps.
137In general, the spectral lines of molecules are
1. Amore complex than those of atoms.
2. Bthe same as the atoms they contain.
3. Conly absorption lines.
4. Dless complex than those of atoms.
5. Enonexistent.
138 Electromagnetic radiation
1. Acan only travel in a dense medium.
2. Bhas only the properties of waves.
3. Ccan behave both as a wave and as a particle.
4. Dis the same as a sound wave.
5. Ehas nothing in common with radio waves.
139In a hydrogen atom, a transition from the 2nd to the 1st excited state will produce
1. Athe bright red Balmer alpha emission line.
2. Bno emission line.
3. Ca dark absorption line.
4. Dan ultraviolet spectral line.
5. Ethree different emission lines.
140For hydrogen, the transition from the first to third excited state produces
1. Aa red emission line.
2. Ba blue green absorption line.
3. Ca violet emission line.
4. Dan infrared line.
5. Ean ultraviolet line.
141The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
1. AThis is an example of the photoelectric effect.
2. BThis is an example of the Doppler effect.
3. CThe second law of Kirchhoff explains this.
4. DThe star is not rotating.
5. EThe star has a radial velocity towards us.
142 If a source of light is approaching us at 3,000 km/sec, then all its waves are
1. Ablue shifted by 1%.
2. Bred shifted by 1%.
3. Cnot affected, as c is constant regardless of the direction of motion.
4. Dblue shifted out of the visible spectrum into the ultraviolet.
5. Ered shifted out of the visible into the infrared.
143If the rest wavelength of a certain line is 600 nm, but we observe it at 594 nm, then
1. Athe source is approaching us at 1 % of the speed of light.
2. Bthe source is approaching us at 0.1 % of the speed of light.
3. Cthe source is receding from us at 10% of the speed of light.
4. Dthe source is getting 1% hotter as we watch.
5. Ethe source is spinning very rapidly, at 1% of the speed of light.
144 According to the Zeeman effect, the splitting of a sunspotʹs spectral lines is due to
1. Atheir rapid rotation.
2. Btemperature variations.
3. Ctheir magnetic fields.
4. Dtheir radial velocity.
5. Ea Doppler shift.
145The total energy radiated by a blackbody depends on
1. Athe fourth power of its temperature.
2. Bthe square of its temperature.
3. Cthe square root of its temperature.
4. Dthe fourth root of its temperature.
5. Ethe cube of its temperature.
146Radio waves, visible light, and X-rays are all types of electromagnetic radiation.
1. AVerdadero
2. BFalso
147The frequency of a water wave gives us its height.
1. AVerdadero
2. BFalso
148If a new wave arrives on shore every two seconds, then its frequency is 2 Hz.
1. AVerdadero
2. BFalso
149The greater the disturbance of the medium, the higher the amplitude of the wave.
1. AVerdadero
2. BFalso
150While gravity is always attractive, electromagnetic forces are always repulsive.
1. AVerdadero
2. BFalso
151 Changing the electric field will have no effect on the magnetic fields of a body.
1. AVerdadero
2. BFalso
152As they move through space, the vibrating electrical and magnetic fields of a light wave must move perpendicular to each other.
1. AVerdadero
2. BFalso
153Wave energy can only be transmitted through a material medium.
1. AVerdadero
2. BFalso
154
The spectral lines of each element are distinctive to that element, whether we are looking at emission or absorption lines.
1. AVerdadero
2. BFalso
155An emission line results from an electron falling from a higher to lower energy orbital around its atomic nucleus.
1. AVerdadero
2. BFalso
156 The shorter a waveʹs wavelength, the greater its energy.
1. AVerdadero
2. BFalso
157 Spectral lines are produced when an electron makes a transition from one energy state to another.
1. AVerdadero
2. BFalso
158In the Bohr model of the atom, an electron can only exist in specific, well-defined energy levels.
1. AVerdadero
2. BFalso
159When an electron in a hydrogen atom drops from the second to the first excited energy state it emits a bright red emission line called hydrogen alpha.
1. AVerdadero
2. BFalso
160The Zeeman effect reveals the presence of strong magnetic fields by the splitting of spectral lines.
1. AVerdadero
2. BFalso
161The broader the spectral line, the higher the pressure of the gas that is creating it
1. AVerdadero
2. BFalso
162In the Doppler effect, a red shift of spectral lines shows us the source is receding from us.
1. AVerdadero
2. BFalso
163The larger the red shift, the faster the distant galaxy is rushing toward us.
1. AVerdadero
2. BFalso
164If a fire truckʹs siren is rising in pitch, it must be approaching us.
1. AVerdadero
2. BFalso
165You would perceive a change in a visible light waveʹs amplitude as a change in its color.
1. AVerdadero
2. BFalso
166 Spectroscopy of a star can reveal its temperature, composition, and line-of-sight motion.
1. AVerdadero
2. BFalso
167The Doppler effect can reveal the rotation speed of a star by the splitting of the spectral lines.
1. AVerdadero
2. BFalso
168The most energetic photons are [blank_start]gamma rays[blank_end].
1. Agamma rays
169The Sun's blackbody curve peaks in the [blank_start]visible[blank_end] portion of the spectrum.
1. Avisible
170A dense, hot body will give off a(n) [blank_start]continuous[blank_end] spectrum.
1. Acontinuous
171The common element discovered in the Sun's spectrum before it was found is [blank_start]helium[blank_end].
1. Ahelium
172The ability of a telescope to separate two closely spaced stars is called [blank_start]resolution[blank_end].
1. Aresolution
173Grazing incidence optics are critical to focusing [blank_start]X-rays[blank_end].
1. AX-rays
174[blank_start]Adaptive[blank_end] optics greatly reduces the effect of atmospheric turbulence by deforming the shape of the mirror by computer control.
1. AAdaptive
175All planets lie in orbits close to the [blank_start]ecliptic[blank_end] plane.
1. Aecliptic
176A solid body from the outer solar system that arrives intact on the Earth's surface is called a [blank_start]meteorite[blank_end].
1. Ameteorite
177The [blank_start]Oort Cloud[blank_end] is a vast, spherical array of long period comet nuclei far beyond the orbit of Neptune.
1. AOort Cloud
178The [blank_start]Kuiper[blank_end] Belt bodies orbit beyond Neptune, but like the planets stay close to ecliptic plane and its fairly circular orbits.
1. AKuiper
179In composition, the [blank_start]terrestrial[blank_end] planets have rocky materials like the asteroids.
1. Aterrestrial
180Planets with orbital semimajor axes less than 0.1 AU are called [blank_start]hot[blank_end].
1. Ahot
181Meteorite material dates the formation of the solar system at about [blank_start]4.6[blank_end] billion years.
1. A4.6
182Streaks of light made when small debris hits our atmosphere are called [blank_start]meteors[blank_end].
1. Ameteors

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Descripción: First Year Astronomy Test sobre Midterm 2, creado por Roseanne Jones el 07/11/2015.
Autor: Roseanne Jones
Idioma: English
Visitas: 4
Etiquetas: astronomy first year
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