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  • 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 <img alt="(given \, \, speed\, \,

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\left.=330 \mathrm{~ms}^{-1}\right)   _______ Hz.

Option: 1

400


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

f=\left(\frac{\mathrm{v} \pm \mathrm{v}_0}{\mathrm{v} \pm \mathrm{v}_{\mathrm{s}}}\right) f_0=\frac{330 \times 320}{330-66}=\frac{330 \times 320}{264}=400

Posted by

Ramraj Saini

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