The engine of a train moving with speed $10 \mathrm{~ms}^{-1}$ towards a platform sounds a whistle at frequency 400 Hz . The frequency heard by a passenger inside the train is (neglect air speed. Speed of sound in air $330 \mathrm{~ms}^{-1}$ )
Select the correct option:
A
200 Hz
B
400 Hz
C
412 Hz
D
388 Hz
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
The relative velocity of a passenger with source of sound (engine) is 0. So there will be no doppler’s effect. So frequency heard is 400 Hz.
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