NEET Physics Waves Questions Solved


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

(1) 9 : 8

(2) 8 : 9

(3) 1 : 1

(4) 9 : 10

(Speed of sound v = 340 m/s)

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