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Astronomy Test #3
Terms in this set (31)
t/f you are currently emitting electromagnetic waves.
t/f smaller worlds generally have thinner lithospheres
t/f emission is an important geological process on venus
T/F Lines of a particular element appear at the same wavelength in both emission and absorption line spectra.
convection occurs in the troposphere but not in the lower parts of the stratosphere because
b. lower altitudes of the troposphere are warmer than higher altitudes, unlike in the lower stratosphere
If 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
c. an emission line spectrum
Which forms of light are lower in energy and frequency than the light that our eyes can see?
a. infrared and radio
The choices below describe four hypothetical planets. Which one would you expect to have the hottest interior?
d. size: twice as big as earth. distance from the sun: same as mars. rotation rate: once every 6 months
Suppose you want to know the chemical composition of a distant star. Which piece of information is most useful to you?
b. the wavelengths of spectral lines in the star's spectrum
When an atom absorbs a photon containing energy, any of the following can happen except which?
a. an electron moves from an upper energy level to a lower one
The cores of the terrestrial worlds are made mostly of metal because ______.
b. metals sunk to the centers a long time ago when the interiors were molten throughout
the caloris basin on mercury covers a large region of the planet, but few smaller craters have formed on top of it. from this we conclude that...
b. the caloris basin formed toward the end of the solar system's period of heavy bombardment
How does the greenhouse effect work?
a. Greenhouse gases transmit visible light, allowing it to heat the surface, but then absorb infrared light from Earth, trapping the heat near the surface.
Why does Earth have the strongest magnetic field among the terrestrial worlds?
c. it is the only one that's both a partially molten metallic core and reasonably rapid rotation
which of the following statements about the greenhouse affect is true?
e. all of the above are true
Earth's atmosphere contains only small amounts of carbon dioxide because
c. carbon dioxide dissolves in water, and most of it is now contained in the oceans and carbonate rocks
Which internal heat source still generates heat within the terrestrial worlds today?
c. heat from radioactive decay
Which two properties are most important in determining the surface temperature of a planet?
a. distance from the sun and atmosphere
which of the following statements about x rays and radio waves is not true
d. x rays travel through space faster than radio waves
what are the circumstances under which convection can occur in a substance?
a. when the substance is strongly heated from underneath
Venus may have started with an ocean's worth of water. Where is its water now?
b. the water was lost when ultraviolet light broke apart water molecules
earth's atmosphere is heated primarily by what process?
d. absorption of ultraviolet radiation by ozone
all of the following have occurred over long periods of time on earth. which one is thought to have played a major role in long term change in earth's climate?
a. a gradual rise in the atmospheric content of oxygen
given that the speed of light is 3*10^8 m/s. suppose a photon has a frequency of 300 million hertz (300 megahertz) what is the wavelength?
b. 1 meter
all of the following statements about mars are true. which one might have led to a significant loss of atmospheric gas to space?
b. mars lost any global magnetic field that it may have once had
The main process by which heat flows upward through the lithosphere is
everything looks red through a red filter because
b. the filter transmits red light and absorbs other colors.
Mercurys many long tall cliffs
old surface features of the lunar highlands
Mars, Olympus Mons
smooth surface of the lunar maria
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