Radiant energy from the Sun is composed of shorter wavelengths than radiation from the Earth because the Sun
A) has much more thermal energy.
B) has a higher temperature than the Earth.
C) is an energy source while the Earth is primarily an energy receiver.
D) none of the above
Answer: B
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Where does most star formation occur in the Milky Way today?
A) in the halo B) in the bulge C) in the spiral arms D) in the Galactic center E) uniformly throughout the Galaxy
Nuclear Reactions: In the nuclear reaction 
H + 
H ? X + 
He, what is X?
A. 2 protons B. 2 neutrons C. 2H D. 3H E. alpha particle
HDTV is now being introduced in the U.S. It is likely that sales of HDTVs will follow an exponential growth curve during the earliest years of sales
What will be an ideal response?
Particle A has mass m and speed
. Particle B has mass 
and speed 
. How do the magnitudes of their relativistic momenta compare?
A. 
B.
C.