What scattering angle in the Compton effect produces the minimum change in frequency?
A)
45°
B)
90°
C)
0°
D)
180°
E)
270°
C
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Constant Angular Acceleration: A turntable 45 cm in diameter starts from rest and makes its first complete revolution in 3.4 s with constant angular acceleration. If it maintains the same acceleration, how long will it take the turntable to make its second complete revolution?
Fill in the blank(s) with the appropriate word(s).
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)
The greatest gravitational lensing is produced by the ________ that lie in the centers of massive galaxies
Fill in the blank(s) with correct word
What is the direction of the electric field vector 
at point P in the situation shown below? (Assume that the balls are actually point particles equidistant from P.)
A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD