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Physics Review Question Unit: waves Year: 1990 Question#: 60 Question: As observed from the Earth, the light from a star is shifted toward lower frequencies. This is an indication that the distance between the Earth and the star is (1 ) decreasing (2 ) increasing (3 ) constant What is this question really asking? Explanation by: Ryan F. [ Return to question menu ] Answer 1 decreasing INCORRECT decreasing is incorrect because the Doppler effect states the a change in frequency is the result of the motion of the source. A lower frequency change means the source is moving away, a higher frequency means it is moving closer. return to top Answer 2 increasing CORRECT increasing is correct because the Doppler effect states the a change in frequency is the result of the motion of the source. A lower frequency change means the source is moving away, a higher frequency means it is moving closer. return to top Answer 3 constant INCORRECT constant is incorrect because the Doppler effect states the a change in frequency is the result of the motion of the source. A lower frequency change means the source is moving away, a higher frequency means it is moving closer. return to top What's this question really asking? What law states the changing of frequencies due to motion of the source? return to top |
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