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The <strong>Doppler</strong> Effect for Sound<br />
Now the Flash starts running away from the radio.<br />
So, the Flash hears a period T’=t 2 - t 1.<br />
T " = vs vs # v<br />
T =<br />
T<br />
1# v v S<br />
<strong>Doppler</strong> Effect in Cosmology 7