Physics Review Question Unit: waves Year: 1988 Question#: 38 Question: An Earth satellite in orbit emits a radio signal of constant frequency. Compared to the emitted frequency, the frequency of the signal recieved by a stationary observer will appear to be (1 ) higher as the satellite approaches (2 ) higher as the satellite moves away (3 ) lower as the satellite approaches (4 ) unaffected by the satellite's motion What is this question really asking? Explanation by: Allison B. [ Return to question menu ] Answer 1 higher as the satellite approaches CORRECT as the satellite approaches, the waves appear to be pushed together, so the frequency appears higher to the observer. This is a perfect example of the Doppler Effect. return to top Answer 2 higher as the satellite moves away INCORRECT as the satellite moves away, the waves spread out, so they have a lower frequency, not higher. Recheck your understanding of the Doppler Effect. return to top Answer 3 lower as the satellite approaches INCORRECT as the satellite approaches, the waves get closer together (smushed in), so they have a higher frequency, not lower. Recheck your understanding of the Doppler Effect. return to top Answer 4 unaffected by the satellite's motion INCORRECT since the satellite is moving in relationship to the Earth, waves emitted from it will experience the doppler effect, which will change the apparent frequency. return to top What's this question really asking? this question is asking if you can recognize and analyze the doppler effect. return to top |
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