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  • A train whistling at constant frequency is moving towards a station at a constant speed V The train goes past a stationary observer on the station

A train whistling at constant frequency is moving towards a station at a constant speed V. The train goes past a stationary observer on the station. The frequency n′ of the sound as heard by the observer is plotted as a function of time t (Figure). Identify the expected curve.

Answers (1)

The answer is the option (c) When the observer is at rest and source of sound is moving towards the observer, then the observed frequency

n'=\left (\frac{v}{v-v_{s}} \right )n_{0} where n0 is the original frequency of the source of sound 

v=speed of sound in the medium

n'>n_{0}

vs=speed of source 

When the source is moving away from the observer

n" = \frac{vn_{0}}{v+v_{s}}

n^{''}< n_{0}

Thus, n’ > n” and graph (c) is correct.

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infoexpert24

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