The expression(s) indicating the number of neutrons in a nucleus is
a. A
b. N
c. Z
d. Z + N
e. A – Z
B, E
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What happens to the surface temperature and luminosity when a protostar undergoes convective contraction?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
If a particle in a rigid box has a ground state energy of 1 eV, how much higher in energy is the next state?
A) 2 eV B) 4 eV C) 3 eV D) 5 eV E) 1 eV
What is created by the fusion of three helium nuclei?
B) oxygen C) carbon D) nitrogen E) iron
If the velocity of an object is negative,
a. its speed is decreasing. b. its velocity does not exist. c. it is reversing direction. d. it is moving in the direction labeled negative.