A source of sound and listener are approaching each other with a speed – McqOptions

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1.	A source of sound and listener are approaching each other with a speed of 40 m/s. The apparent frequency of note produced by the source is 400 cps. Then, its true frequency (in cps) is (velocity of sound in air = 360 m/s) [KCET 1999]
A.	420
B.	360
C.	400
D.	320
Answer» E.

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