A main difference between a radio wave and a light wave is
A) wavelength.
B) frequency.
C) both of these
D) neither of these
Answer: C
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The mean free path of a molecule is 
m in an ideal gas at standard temperature and pressure. What is the mean free path when the diameter of the molecule is doubled and the temperature of the gas is doubled?
A. 
B. 
C. 
D. 
E. 
A star like the sun has a luminosity of 
How much mass must be turned into energy each second to produce this power?
A. 
B. 
C. 
D. 
E. 
Fusion processes in stellar cores involving heavy elements ____
a. generate more energy per atom than fusion of lighter elements b. generate less total energy because less atoms are available c. generate energy for longer periods of time for heavier elements d. occur in shells further and further from the center of the core e. occur in larger and larger volumes of the core
What is the difference between emission and absorption in an atom?
A. In absorption, the nucleus goes from a higher to a lower orbit. B. In absorption, the electron goes from a higher to a lower orbit. C. In emission, the nucleus goes from a lower to a higher orbit. D. In emission, the electron goes from a higher to a lower orbit.