What should be the velocity of a sound source moving towards a stationary observer so that apparent frequency is double the actual frequency (Velocity of sound is $v$)
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(c) By using $n' = \left( {\frac{v}{{v - {v_S}}}} \right) $
$\Rightarrow 2n = n\,\left( {\frac{v}{{v - {v_S}}}} \right) $
$\Rightarrow {v_S}\, = \frac{v}{2}$
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