A boxcar is equipped with a red laser at the back of the car and a blue laser at the front of the car. When the boxcar is traveling with speed v, the two lasers send out pulses simultaneously. An observer on the ground sees
A. the two pulses hitting the opposite walls at the same time.
B. the red pulse hitting the front before the blue pulse hits the back.
C. the blue pulse hitting the back before the red pulse hits the front.
C. the blue pulse hitting the back before the red pulse hits the front.
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Exclusion Principle: According to the quantum mechanical model of the hydrogen atom, if the principal quantum number is n, how many different orbital angular momentum quantum numbers are permitted?
A. n/2 B. n C. 2n D. 3n E. 4n
Which of the following is usually burned up in Earth's atmosphere?
a. Asteroid b. Meteoroid c. Meteor d. Meteorite
Tripling the separation between charges changes the potential energy of a pair of point charges by a factor of
A. 3. B. 9. C. 1/3. D. 1/9. E. 1 (no change).
A system in a certain macro state has
microstates. Through some process, the system changes the number of microstates to 
What is the change in entropy for the process?
A. 
B. 
C. 
D. 