A train is moving towards a stationary observer (at t = 0 ) with constant velocity of 20 m/s and aft

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14.Waves and Sound

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A train is moving towards a stationary observer (at $t = 0$) with constant velocity of $20\ m/s$ and after sometime it crosses the observer. Which of the following curve best represents the frequency received by observer $f$ as a function of time ?

A

B

C

D

Solution

$f^{\prime}$ before crossing $=f_{0}\left(\frac{\mathrm{V}}{\mathrm{V}-\mathrm{V}_{\mathrm{S}}}\right)$

$f^{\prime}$ after crossing $=f_{0}\left(\frac{V}{V+V_{S}}\right)$

Standard 11

Physics

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