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  • An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. what is % increases in the apparent frequency ? <st

An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. what is % increases in the apparent frequency ? 

Option: 1

5%


Option: 2

20 %


Option: 3

zero


Option: 4

0.5%


Answers (1)

best_answer

When observer moves towards stationary source,then apparent frequency-

\begin{aligned} & n^{\prime}=\left[\frac{v+v_0}{v}\right] n \\ & n^{\prime}=\left[\frac{v+v / 5}{v}\right] \cdot n=\frac{6}{5} \cdot n \\ & n^{\prime}=1 \cdot 2 n \end{aligned}

Increment in frequency =0.2 n,

so percentage change in frequency \begin{aligned} & =\frac{0.2 n}{n} \times 100 \\ & =20 \% \end{aligned}

Posted by

manish painkra

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