At what speed should a source of sound move s | vedclass

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Question

(D) The apparent frequency $n'$ heard by a stationary observer when the source moves away with speed $v_s$ is given by the Doppler effect formula:$n'

Vedclass · Accepted Answer

$v$

Vedclass · Answer

(D) The apparent frequency $n'$ heard by a stationary observer when the source moves away with speed $v_s$ is given by the Doppler effect formula:$n' = n \left( \frac{v}{v + v_s} \right)$Given that the apparent frequency is half of the original frequency,$n' = n/2$.Substituting this into the formula:$\frac{n}{2} = n \left( \frac{v}{v + v_s} \right)$$\frac{1}{2} = \frac{v}{v + v_s}$$v + v_s = 2v$$v_s = v$Therefore,the source must move away from the observer at a speed equal to the speed of sound $v$.

At what speed should a source of sound move so that a stationary observer finds the apparent frequency equal to half of the original frequency?

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