There are three sources of sound of equal intensity with frequencies 400, 401 and 402 vib/sec . The number of beats heard per se

There are three sources of sound of equal intensity with frequencies 400, 401 and 402 vib/sec . The number of beats heard per second is
A. zero
B. 1
C. 2
D. 4

There are three sources of sound of equal intensity with frequencies 400, 401 and 402 vib/sec . The number of beats heard per second is

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