Home Physics Wave and Sound Doppler’s Effect A source of sound is moving with constant ve…
Physics Wave and Sound Doppler’s Effect MCQ (Single Correct)

A source of sound is moving with constant velocity of 20 m/s emitting a note of frequency 1000 Hz. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him will be (Speed of sound v = 340 m/s)

A
9 : 8
B
8 : 9
C
1 : 1
D
9 : 10

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Verified by Experts
The correct answer is:
A

When source is approaching the observer, the frequency heard

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