## Abstract

We are all familiar with the characteristic change in the pitch of the sound of the siren of an emergency vehicle as it passes. This phenomenon is called the *Doppler effect*. We can explain the effect using the relationship between wave velocity and frequency given by equation (3.5). We assume that the velocity, *c*, of the wave is independent of the velocity of the source of the wave.

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## Copyright information

© Alan J. Davies 1993