1.

The wavelength is 120 cm when the source is stationary. If the source is moving with relative velocity of 60 m/sec towards the observer, then the wavelength of the sound wave reaching to the observer will be (velocity of sound = 330 m/s)

A.            98 cm                                      
B.            140 cm
C.            120 cm                                    
D.            144 cm
Answer» B.            140 cm


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