The light directly from the Sun is
a. polarized. b. unpolarized.
c. horizontally polarized. d. vertically polarized.
b
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Compared with the spectral lines in the solar spectrum, lines in a supergiant star's spectrum are
a. more narrow. b. broader. c. weaker. d. stronger. e. b & c
____________________ waves are seismic waves that do not travel through Earth's liquid core
Fill in the blank(s) with correct word
Kepler's discovery that T2 /r3 = K applies
A) to orbits where K is a universal constant. B) only to circular orbits. C) to lunar motion provided K is the same for planetary motion. D) to elliptical orbits where r is the average distance.
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 inside the boxcar 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.