Which of the following correctly lists the terrestrial worlds in order from the thickest atmosphere to the thinnest atmosphere? (Note: Mercury and the Moon are considered together in this question.)
A) Venus, Mars, Moon/Mercury, Earth
B) Mars, Venus, Earth, Moon/Mercury
C) Earth, Venus, Mars, Moon/Mercury
D) Venus, Earth, Mars, Moon/Mercury
D
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Cepheid variable stars stop pulsating when:
A) they evolve out of the instability strip of the H-R diagram. B) they enter the zero-age main sequence. C) they begin their stable lives fusing hydrogen. D) they reach the lower edge of the main sequence of the H-R diagram.
The method of standard candles can be used to measure a star's ________.
A. luminosity B. brightness C. mass D. distance E. absolute magnitude
As atmospheric pressure increases, what happens to the velocity of sound? (Assume that all other factors remain constant.)
A) It increases. B) It decreases. C) It does not change. D) It increases on warm days and decreases on cold days.
Suppose you photographed Earth's dark side from space, using ultraviolet-sensitive film, and using infrared-sensitive film. What would you expect to see in the photo?
A) Both photos would show radiation coming from all over Earth. B) The ultraviolet photo would show only artificial sources such as streetlights, while the infrared photo would show radiation coming from all over Earth. C) Neither photo would show anything--they would both be completely dark. D) Both photos would show only artificial sources, such as streetlights. E) The ultraviolet photo would show radiation coming from all over Earth, while the infrared photo would show only artificial sources such as streetlights.