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Astronomy Lab 2 - 6
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Questions in this quiz (25)
1If a material is highly opaque, then it
- Areflects most light.
- Babsorbs most light
- Ctransmits most light.
- Demits most light.
- Escatters most light.
2When light reflects off an object like a mirror, what is the relation between the angle of incidence and the angle of reflection?
- Aangle of incidence = angle of reflection
- Bangle of incidence + angle of reflection = 90°
- Cangle of incidence - angle of reflection = 90°
- Dangle of incidence + angle of reflection = 180°
- EIt depends on the material that the light reflects off.
3If a material is transparent, then it
- Aemits light well.
- Bscatters light well.
- Creflects light well.
- Dtransmits light well.
- Eabsorbs light well.
4Grass (that is healthy) looks green because
- Ait transmits green light and emits other colors
- Bit reflects green light and absorbs other colors.
- Cit emits green light and absorbs other colors.
- Dit absorbs green light and emits other colors.
5The frequency of a wave is
- Aequal to the speed of the wave divided by the wavelength of the wave.
- Bmeasured in hertz (Hz).
- Cthe number of peaks passing by any point each second.
- Dmeasured in cycles per second.
- Eall of the above
6How are wavelength, frequency, and energy related for photons of light?
- ALonger wavelength means lower frequency and lower energy.
- BLonger wavelength means higher frequency and higher energy
- CLonger wavelength means lower frequency and higher energy
- DLonger wavelength means higher frequency and lower energy.
- EThere is no simple relationship because different photons travel at different speeds.
7Suppose you built a scale-model atom in which the nucleus was the size of a tennis ball. About how far would the cloud of electrons extend?
- Aseveral kilometers
- Ba few tens of meters
- Cseveral centimeters
- Dto the Sun
- Ea few meters
8Which of the following statements about electrical charge is true?
- ATwo negative charges will attract each other.
- BTwo positive charges will attract each other
- CA positive charge and a negative charge will attract each other.
- DA positive charge and a negative charge will repel each other.
9How much electrical charge does an atom with 6 protons, 6 neutrons, and 5 electrons have?
- Aa positive charge of +1
- Ba negative charge of -5
- Ca total charge of +17
- Da positive charge of +7
- Enone of the above
10If you heat a gas so that collisions are continually bumping electrons to higher energy levels, when the electrons fall back to lower energy levels the gas produces
- Aan absorption line spectrum.
- Ban emission line spectrum.
- CX rays
- Dthermal radiation.
- Eradio waves.
11Which of the following objects is not a close approximation of a thermal emitter?
- Ahot, thin gas
- Ba filament in a light bulb
- Cyou
- Da planet
- Ea star
12When white light passes through a cool cloud of gas, we see
- Avisible light.
- Binfrared light.
- Cthermal radiation.
- Dan emission line spectrum.
- Ean absorption line spectrum.
13If one object has a large redshift and another object has a small redshift, what can we conclude about these two objects?
- AThe one with the large redshift is hotter and therefore is putting out more radiation
- BThe one with the large redshift is moving away from us, and the one with the small redshift is moving toward us.
- CThe one with the large redshift is moving away from us faster than the one with the small redshift.
- DThe one with the large redshift is moving toward us faster than the one with the small redshift.
14The spectra of most galaxies show redshifts. This means that their spectral lines
- Ahave wavelengths that are longer than normal.
- Balways are in the red part of the visible spectrum
- Chave normal wavelengths, but absorption of light makes them appear red.
- Dhave wavelengths that are shorter than normal.
- Ehave a higher intensity in the red part of the spectrum.
15A gas heated to millions of degrees would emit
- Amostly X rays.
- Bmostly ultraviolet light.
- Can equal amount of all wavelengths of light.
- Dmostly radio waves.
- Eno light, because it is too hot
16Which of the following statements about thermal radiation is always true?
- AA hot object emits more radio waves than a cool object.
- BA hot object emits more total radiation per unit surface area than a cool object.
- CA hot object emits more total radiation than a cool object
- DA hot object emits more X rays than a cool object.
- EA hot object emits less total radiation than a cool object.
17An electron-volt is
- Aan amount of energy much smaller than a joule.
- Bthe charge of one electron.
- Can amount of energy much larger than a joule.
- Dthe energy of one electron.
- Ethe energy jump between the first and second energy levels of hydrogen.
18How can an electron in an atom lose energy to go from a higher energy level to a lower energy level?
- AIt loses gravitational potential energy.
- BIt releases a photon equal in energy to its own energy drop.
- CIt loses kinetic energy.
- DIt absorbs a photon equal in energy to its own energy drop.
- EIt exchanges gravitational potential energy for kinetic energy.
19Without telescopes or other aid, we can look up and see the Moon in the night sky because it
- Aglows through radioactive decay.
- Bemits visible light.
- Cemits thermal radiation.
- Dreflects visible light
- Ereflects infrared light.
20The loss of an electron from a neutral helium atom results in
- Aionized helium
- Bionized deuterium.
- Cneutral deuterium.
- Dionized hydrogen.
- Eneutral hydrogen.
21When an atom absorbs a photon containing energy, any of the following can happen except which?
- AAn electron moves from a lower energy level to an upper one.
- BThe atom becomes excited.
- CThe atom is ionized
- DAn electron moves from an upper energy level to a lower one.
22Sublimation is the process in which
- Aelectrons are stripped from atoms
- Belectrons are captured by ion
- Cmolecules go from the solid phase to the gas phase.
- Dmolecules go from the solid phase to the liquid phase.
- Emolecules go from the liquid phase to the gas phase.
23At extremely high temperatures (e.g., millions of degrees), which of the following best describes the phase of matter?
- Aa gas of rapidly moving molecules
- Ba plasma consisting of rapidly moving, neutral atoms
- Ca gas consisting of individual, neutral atoms, but no molecules
- Da plasma consisting of positively charged ions and free electrons
- Enone of the above (At these extremely high temperatures, matter cannot exist.
24An atom of the element iron has an atomic number of 26 and an atomic weight of 56. If it is neutral, how many protons, neutrons, and electrons does it have?
- A26 protons, 56 neutrons, 26 electrons
- B26 protons, 30 neutrons, 26 electrons
- C13 protons, 43 neutrons, 13 electrons
- D13 protons, 56 neutrons, 13 electrons
- E26 protons, 30 neutrons, 30 electrons
25From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?
- Agamma rays, X rays, ultraviolet, visible light, infrared, radio
- Binfrared, visible light, ultraviolet, X rays, gamma rays, radio
- Cgamma rays, X rays, visible light, ultraviolet, infrared, radio
- Dvisible light, infrared, X rays, ultraviolet, gamma rays, radio
- Eradio, infrared, visible light, ultraviolet, X rays, gamma rays
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- Astronomy Exam 2 Quiz on Astronomy Lab 2 - 6, created by Tyler Bakley on 01/11/2016.
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- Tyler Bakley
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