If the wavelength of a light beam is doubled, what happens to the momentum of the photons in that light beam?
A) It is reduced by one-fourth of its original value.
B) It is increased to four times its original value.
C) It is doubled.
D) It is halved.
E) It stays the same.
D
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Which pair of ball-drop experiments will best test whether mass affects the acceleration of gravity?
Exp 1. Mass 0.5 kilograms, height 20 meters Exp 2. Mass 5.0 kilograms, height 20 meters Exp 3. Mass 0.5 kilograms, height 30 meters A) Exp 1 and 3 B) Exp 1 and 2 C) Exp 2 and 3
A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct?
A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration points downward.
Suppose a jet is cruising at a constant velocity due east. At the instant the jet is above your head, what is the direction of the jet’s angular momentum around you? Choose from the possible directions presented in problem C7T.3, remembering that this is a top view, with A corresponding to north, C to east, and so on. 
A. A B. B C. C D. D E. Upward F. Downward T. (The vector is zero)
Explain how it is possible that there are moons within habitable zones that have habitable surfaces in other solar systems given that no such thing exists in our own solar system
What will be an ideal response?