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A train is moving on a straight track with speed 20 ms^-1. It is blowing its whistle at the frequency of 1000 Hz.

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A train is moving on a straight track with speed 20 ms-1. It is blowing its whistle at the frequency of 1000 Hz. The Percentage change in the frequency heard by a person standing near the track as the train passes him is close to (speed of sound = 320 ms-1)

(a) 6%

(b) 12%

(c) 18%

(d) 24%

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1 Answer

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Best answer

Correct Option (b) 12%

Explanation:

Apparent frequency heard by the person before crossing the train.

Similarly, apparent frequency heard, after crossing the trains

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