The NASA mission(s) that landed on Mars in 1976 was (were) the:
A) Voyagers.
B) Magellan lander.
C) Vikings I and II.
D) Venera 14.
E) Galileo probe.
C
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What is the troposphere?
A) the lowest layer in the atmosphere B) the part of the atmosphere that absorbs optical light C) the part of the atmosphere that absorbs ultraviolet D) the part of the atmosphere that absorbs X-rays E) the highest layer in the atmosphere
If you were to take a voyage across the Milky Way, what kind of material would you spend most of your time in?
A) empty space—a pure vacuum B) dusty molecular clouds C) star clusters D) warm, rarefied clouds of atomic hydrogen E) cool, dense clouds of atomic hydrogen
When a hydrogen atom absorbs a photon that raises it to the n = 7 state, what is the greatest number of photons that can be emitted by that atom as it returns to the ground state?
a. 6 b. 7 c. 8 d. 14 e. The correct answer is not given.
If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?
a. Both would be earlier. b. Both would be later. c. Sunrise would be earlier and sunset later. d. Sunrise would be later and sunset earlier.