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  4. A train blowing a whistle of frequency 320 Hz approaches an observer standing on the platform at a speed of 66 m / s. The frequency observed by the observer will be (given speed of sound =330 ms -1 ) Hz,

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Q. A train blowing a whistle of frequency $320 \,Hz$ approaches an observer standing on the platform at a speed of $66 \,m / s$. The frequency observed by the observer will be (given speed of sound $=330 ms ^{-1}$ ) ____$Hz$,

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Solution:

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$ f_{\text {app }}=f\left(\frac{v}{v-v_s}\right)$
$ =320\left(\frac{330}{330-66}\right)$
$ =400 Hz $