Test
Homework 1
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Preguntas del test (22)
1What type of object is our sun?
- Aa planet
- Ba star
- Can active galactic nucleus
- Da rare object - different than any other type of object found in the universe
2What is the spectral type of our sun?
- AG2 V
- BA7 III
- CO1 I
- DM67
- EOur sun doesn't have a spectral type because it doesn't have a spectrum
3What are the three layers of the sun's atmosphere, in order of increasing distance from the center of the sun?
- Aphotosphere, chromosphere, corona
- Bphotosphere, corona, chromosphere
- Ccorona, chromosphere, photosphere
- Dchromosphere, photosphere, corona
4Which type of spectrum do most stars, including our sun, exhibit?
- Acontinuous spectrum
- Bemission line spectrum
- Cabsorption line spectrum
- Dno spectrum - most stars do not exhibit a spectrum
5Most of the visible light we see coming from the sun originates from the
- Achromosphere
- Bphotosphere
- Ccorona
- Dsunspots
- Emagnetic field
6The fact that the edge of the solar disk (what we see when we look at the sun) is fainter and redder than the center is referred to as Limb Darkening. Limb darkening is a result of the fact that
- Awhen we look toward the center of the sun, we see down to hotter layers
- Bwhen we look toward the center of the sun, we see down to the cooler layers
- Cwe can see completely through the material at the edge of the solar disk
- Dlight from the edge of the disk is reflected, whereas the light from the center is emitted
7Which method of energy transport supplies a constant source of heat to the bottom of the sun's photosphere, keeping it at a steady 5800K?
- Aconvection
- Bradiation
- Cconduction
- Dx-ray heating
8What type of spectrum is produced by the chromosphere of the sun?
- Aa continuous spectrum
- Ban absorption line spectrum
- Can emission line spectrum
- Da blackbody spectrum
9Which of the following is responsible for the sun losing a tiny fraction of its total mass each year?
- Asolar wind from the corona
- Bmagnetic field loops that trap plasma
- Cthe solar cycle
- Dthe Maunder Minimum
10The chromosphere and corona are believed to be heated by
- Acharged particles being accelerated by the Sun's magnetic field
- Bsunspots
- Cshock waves rising from below the photosphere
- Ddifferential radiation
11Helioseismology uses observations of how sound waves produce [blank_start]__________[blank_end] the light coming from the surface of the sun to model the temperature and density structure of the solar interior
- Adoppler shift of
- Bgravitational settling of
- Csolar activity emitted by
- Dtime dilation of
- Ethe magnetic field effects on
12Solar models based on helioseismology are successful at predicting which of the following?
- Aspectral type
- Blimb darkening
- Csunspots
- Dsolar activity
- Esolar eclipses
13Why are sunspots cooler than the photosphere?
- ABecause the strong magnetic fields inhibit nuclear fusion below the spots
- BBecause the strong magnetic field inhibits convection below the spot
- CBecause the strong magnetic field encourages the escape of photons from the spot, thus cooling the spot
14The [blank_start]___________[blank_end] coincides with the period known as the "little ice age" - a period in which Europe and North America experienced cooler than normal temperatures. This provides one piece of evidence that suggests a link between solar activity and the amount of solar energy
- Acoronal hole
- BBabcock sunspot model
- CMaunder sunspot minimum
- DCoulomb barrier
- Eweak solar forces
15The figured illustrated is called a butterfly diagram. What does it tell us?
- AIt tells us that at the beginning of a solar cycle, sunspots form at high solar latitudes (toward the poles)
- BIt tells us that as the solar cycle proceeds, sunspots appear at lower and lower solar latitudes (toward the equator)
- CIt tells us that at the beginning of a solar cycle, sunspots are large, but get smaller and more numerous as the cycle progresses
- DIt tells us that the chromosphere cools as the sunspot cycle progresses
- EIt tells us that one sunspot cycle must come to a complete end before the next cycle can begin
16Which of the following suggests that sunspots are associated with very strong magnetic fields?
- AThe fact that light coming from sunspots is highly polarized
- BThe Zeeman effect - the splitting of spectral lines in the sunspot spectrum - is observed at sunspot locations
- CIntense radio emissions have been observed to come from sunspots
- DThe emission of gamma rays from sunspots has been theorized
17The sun's magnetic field is much more complex and less stable than Earth's magnetic field. Astronomers think that one of the underlying causes of the sun's complex magnetic field is
- Athe sun's differential rotation which twists and complicates magnetic fields
- Bthe sun's rotational wobble which carries the magnetic field with it
- Cthe sun's remarkably slow rotation rate which allows for complex magnetic fields to develop
- Dnone of these - the sun's magnetic field is just as stable and no more complex than Earth's
18If the leading sunspot in a sunspot pair in the northern hemisphere of the sun has a north polarity, what will the polarity of a similar sunspot be 22 years from now?
[blank_start]____________[blank_end]- Anorth
19The sun's magnetic field is evident in the looped shapes of
- Asolar flares
- Bsunspots
- Cthe corona
- Dgranules
- Eprominences
20In some regions of the corona, the magnetic field does not loop back to the sun and the gas escapes unimpeded. These regions are called [blank_start]___________[blank_end] and are believed to be the source of the solar wind.
- Aprominences
- Bflares
- Cgranules
- Dcoronal holes
- Eauroras
21Look at the lower right-hand quadrant of the sun. What is happening?
- AAurora Borealis
- BSolar eclipse
- CEruptive prominence
- DQuiescent (quiet) prominence
- EHeliosphere ejection
22The solar wind
- Ais composed of electrons and protons
- Bhas velocities of hundreds of kilometers/second
- Ccan reach all the way to the surface of the Earth during sunspot maximum
- Dusually forms due to a coronal hole
- Ecauses sunspots to disappear temporarily
- Fis formed by the thermal expansion of the photosphere
Información
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- Astronomy Test sobre Homework 1, creado por Em Grace el 22/04/2019.
- Autor
- Em Grace
- Idioma
- English
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