Laser light is ________ and monochromatic, and usually of much ________ intensity than the light from the light bulb
a. coherent b. incoherent
c. lower d. higher
a, d
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Three point charges are positioned as follows: 
is at (0.00 m, 0.00 m), 
is at (1.20 m, 0.00 m), and
at (1.20 m, 1.60 m). If
what is the magnitude of the force on 
a. 
b. 
c. 
d. 
e. 
Which of these did NOT occur at decoupling?
A) The cosmic microwave radiation was released from matter. B) Neutral atoms were formed. C) Matter dominated radiation. D) Electrons began to orbit protons. E) The universe became transparent.
A metal surface is illuminated with blue light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the blue light is increased, electrons are ejected
A) at the same rate, but with more energy per electron. B) at the same rate, but with less energy per electron. C) at an increased rate with no change in energy per electron. D) at a reduced rate with no change in energy per electron.
Observer A sees a pendulum oscillating back and forth in a relativistic train and measures its period to be TA. Observer B moves together with the train and measures the period of the pendulum to be TB. These two results will be such that
A) TA > TB. B) TA = TB. C) TA < TB. D) TA could be greater or smaller than TB depending on the direction of the motion.