When an automobile moves towards a listener, does the sound of its horn seem relatively low pitched, high pitched or normal?

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Tanner Hamilton · Accepted Answer

The peak of the sound wave that arrives at   t  =      t          1       did not have to travel as far as the previous peak did because the car came closer. That means that the time between the 2 peaks was less than if the car was standing still. Frequency, f, is  f  =            n      u      m      b      e      r             o      f             p      e      a      k      s              t      i      m      e      Therefore the frequency you heard was higher than if the car was standing still. Higher frequency means higher pitch.

When an automobile moves towards a listener, does the sound

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