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Two sources of sound placed close to eac...

Two sources of sound placed close to each othe , are emitting progressively waves given by `y_1 = 4sin 600 pi t` and `y_2=5 sin 608 pi t`. An observer located near these two source of sound will hear.

A

8 beats per second with intemity ratio `25:16` between waxing and waning

B

8 beats per second with intensity ratio `81:1` between waxing and waning

C

4 beats per second with intensity ratio `81:1` between waxing and waning

D

4 beats per second with intensity ratio `25:16` between waxing and waning

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