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The <strong>Doppler</strong> Effect for Sound<br />
The radio emits a series of “beeps,”<br />
with period T. If the Flash is<br />
stationary, he will hear the beeps<br />
with a period T’ = T. There is no<br />
<strong>Doppler</strong> shift.<br />
<strong>Doppler</strong> Effect in Cosmology 3