With what velocity an observer should move relative to a stationary source so that he hears a sound of double the frequency of source
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(a)By using $n' = n\,\left( {\frac{v}{{v - {v_S}}}} \right)$
$2n = n\,\left( {\frac{{v - {v_O}}}{{v - 0}}} \right)$ ==> ${v_O} = - v = - $(Speed of sound)
Negative sign indicates that observer is moving opposite to the direction of velocity of sound, as shown
$2n = n\,\left( {\frac{{v - {v_O}}}{{v - 0}}} \right)$ ==> ${v_O} = - v = - $(Speed of sound)
Negative sign indicates that observer is moving opposite to the direction of velocity of sound, as shown
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