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Physics Review Question Unit: Waves Year: 1997 Question#: 41 Question: The driver of a car sounds the horn while traveling toward a stationary person. Compared to the sound of the horn heard by the driver, the sound heard by the stationary person has (1 ) lower pitch and shorter wavelength (2 ) lower pitch and longer wavelength (3 ) higher pitch and shorter wavelength (4 ) higher pitch and longer wavelength What is this question really asking? Explanation by: Jay D [ Return to question menu ] Answer 1 lower pitch and shorter wavelength INCORRECT This is incorrect because the shorter wavelength would be high pitched. Consult the Doppler effect. return to top Answer 2 lower pitch and longer wavelength INCORRECT This would be the case if the car was traveling away from the observer. Consult the Doppler Effect. return to top Answer 3 higher pitch and shorter wavelength CORRECT This is correct because of the Doppler effect. The wave is high pitched and short wavelength. return to top Answer 4 higher pitch and longer wavelength INCORRECT This is incorrect because you can't possibly have a higher pitch and longer wavelength. The two are inversely related. Consult the Doppler Effect return to top What's this question really asking? This question is asking, if a car was coming towards a stationary person what type of wave would the person hear. return to top |
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