With what velocity should an observer approach a stationary sound source so that the apparent frequency of sound appears to be double the actual frequency? ($v$ is the velocity of sound). - DASH

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Question

With what velocity should an observer approach a stationary sound source so that the apparent frequency of sound appears to be double the actual frequency? ($v$ is the velocity of sound).

$\frac{v}{2}$

$3v$

$2v$

$v$

Solution

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