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Physics Wave and Sound Mix MCQ (Single Correct)

A source of sound producing sound of frequency 100 Hz is moving towards a wall with velocity 20 m/s as shown. If O 1 and O 2 are two stationary observers and beat frequencies heard by them are f 1 and f 2 respectively between sound directly from source and sound reflected from wall. Then: (Assume velocity of sound to be 330 m/s) –

A
f 1 = 0 Hz
B
f 2 = 0 Hz
C
f 1 > f 2
D
f 1 < f 2

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(b, c)

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