NEET UG PHYSICS MCQ: WAVES

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A train moving at a speed of

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

towards a stationary object, emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is {speed of sound in air is

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

]

View answer and explanation

Correct option: C

5000 Hz

Option C (5000 Hz) is correct because it is the frequency of the echo detected by the train driver, calculated using the Doppler effect twice.

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