Someone on the near side of the Moon would observe Earth rise once every

a. 24 hours.
b. 24 hours and 50 minutes.
c. 29.5 Earth days.
d. None of these, the observer would never see Earth rise or set.


d

Physics & Space Science

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You can hear sound through an open window from sources that are not in your line of sight because of

a. interference. b. diffraction. c. the sound level. d. the Doppler effect. e. none of the above.

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The big bang created

A) space and time. B) matter and energy. C) Both of the above. D) None of the above.

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The intensity of a sunspot is found to be 3 times smaller than the intensity emitted by the solar surface. What is the approximate temperature of this sunspot if the temperature of the solar surface is 5800 K?

a. 4400 K b. 470,000 K c. 1900 K d. 7600 K e. 1400 K

Physics & Space Science

Two waves travel simultaneously through the same medium

The first wave is described by y1(x,t) = Acos(kx-?t) and the second wave by y2(x,t) = A cos(kx-?t + ?). If the amplitude of the resulting superposition is A/2, what are the possible values of ?? A) ?/6, -?/6 B) ?/3, -?/3 C) ?/8, -?/8 D) 60°, -60° E) ?/4, -?/4

Physics & Space Science