Rays of light traveling through different media hit the boundary between the media and the air. The angle of incidence is the same in each case. Which medium has the largest index of refraction?
A. A
B. B
C. C
D. D
Answer: D
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In the Compton effect, a photon of wavelength 
and frequency f is scattered from an electron. Initially, at rest
A. the electron gains energy from the photon so that the scattered photon's wave length is less than
B. the electron gives energy to the scattered photon so the photon's frequency is greater than f.
C. momentum is not conserved, but energy is conserved.
D. the photon loses energy so that the scattered photon has a frequency less than f.
Compared to the speed of a 400 Hz sound, the speed of a 200 Hz sound through air is
A. twice as great. B. the same. C. one half as great. D. none of these answers are correct
A spiral galaxy has a small bright central region and its spectrum shows that it contains hot, rapidly moving gas. It is most likely a ________ galaxy.
A. BL Lac B. barred spiral C. Seyfert D. quasar E. radio
Colors appear different to us because of their photons' different:
A) speeds. B) amplitudes. C) frequencies. D) magnetic fields. E) polarization.