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25 January, 23:28

Which of these would be best explained by the Doppler effect? A) the change in frequency as you shorten a guitar string. B) the change in pitch heard as an ambulance approaches you. C) the change in volume as a train pulls away from the station. D) the change in seed of a sound wave as it travels from air into water.

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  1. 26 January, 00:40
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    The correct answer is B) the change in pitch heard as the ambulance approaches.

    In fact, doppler effect occurs when the source of a wave is moving with respect to the observer. In this case, the source is the ambulance and the wave is a sound wave. The result is that there is a shift of the frequency (and therefore of the pitch) as seen by the observer, with respect to the original frequency of the source.
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