The speed of a vertically-thrown ball at the top of its path is
A) zero.
B) 10 m/s2.
C) between zero and 10 m/s2.
D) dependent on the mass of the ball.
Answer: A
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Suppose that an atom has two energy levels separated by an energy difference ?E. When such atoms are in thermal contact with a reservoir at temperature T, there is roughly 1 atom in the higher state for every 4 in the lower state. What is the approximate ratio of ?E to kBT?
A. 
B. 4
C. ln 4
D. ?ln 4
E. e?1/4
F. e?4
T. Other (specify)
A self-sustained chain reaction occurs when the reproduction constant, K, is equal to
a. 3.0 b. 2.0 c. 2.5 d. 1.0 e. 0.5
In a Young's double-slit experiment, what happens to the angular separation between the fringes when the wavelength is decreased at the same time that the slit separation is increased?
a. The relative sizes of the changes need to be known before a definite answer can be given. b. It increases. c. It decreases. d. It stays the same.
About how deep is the photosphere?
A) 300 meters B) 500 meters C) 300 km D) 500 km