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Question

Physics Question on sound

A man is watching two trains, one leaving and the other coming in with equal speeds of 4m/sec. If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air = 320 m/sec) will be equal to

A

6

B

3

C

0

D

12

Answer

6

Explanation

Solution

The correct option is(A): 6