what do you mean by doppler effect
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The Doppler effect is a phenomenon related to the effects of moving objects on an electromagnetic field. In this, an observer in relative motion to a wave experiences a change in the frequency or wavelength of the wave. ... But after passing that point, the frequency or the pitch of the sound lowers with distance
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Doppler effect is a change in frequency and wavelength of a wave. It is caused by the change in distance between the thing creating the wave (causer) and whatever is measuring seeing or hearing the wave (watcher or observer). Another word for "causer" is "sender".
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