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A train blows a whistle of frequency 640 Hz in air. Find the difference in apparent frequencies of the whistle for a stationary observer, when the train moves towards and away from the - Physics

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Numerical

A train blows a whistle of frequency 640 Hz in air. Find the difference in apparent frequencies of the whistle for a stationary observer, when the train moves towards and away from the observer with the speed of 72 Km/hour. [Speed of sound in air = 340 m/s.]

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Solution

`N_1=N(V/(V-V_s))`

`V_s=72 `

`N_1=640(340/(340-20))`

`N_1=680 Hz `

`N_2=N(V/(V+v_s))`

`V_s=72 `

 

`N_2=640(340/(340+20))`

`N_2=604.4 Hz`

Concept: Formation of Beats
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