When a source of light is moving away from an observer, the spectral lines shift toward the red end of the spectrum. This phenomenon is called ________.
A) the Doppler Effect
B) Hubble's Law
C) Hertzsprung-Russell Effect
Answer: A) the Doppler Effect
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The ________ predicts that the optimal location of a service is directly related to the number of people in the area and inversely related to the distance people must travel to access it
A) gravity model B) central place theory C) rank-size rule D) threshold rule E) range predictor
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