JEE PHYSICS MCQ: WAVES

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Application +4 | -1

A train moves towards a stationary observer with speed

34\,\,m{s^{ - 1}}

. The train sounds a whistle and its frequency registered by the observer is

{v_1}

. If the train’s speed is reduced to

17\,\,m{s^{ - 1}}

, the frequency registered is

{v_2}

. If the speed of sound is

340\,\,m{s^{ - 1}}

, then the ratio

{v_1}/{v_2}

View answer and explanation

Correct option: D

19/18

Option D (

19/18

) is correct because it is the ratio of the frequencies calculated using the Doppler effect formula for a moving source and a stationary observer.

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