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21 August, 16:41

Why does a siren have a lower pitch as it moves away from you? A The period of the sound wave is decreased B The amplitude of the sound wave is increased C The crests of the sound wave are farther apart D The troughs of the sound wave are spaced closer together.

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Answers (2)
  1. 21 August, 16:52
    0
    it is letter C

    there is a video explaining this
  2. 21 August, 17:05
    0
    C

    Explanation:

    I think it's C because when it moves further away the sound wave is moving apart
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