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Two sources of sound placed closed to ea...

Two sources of sound placed closed to each other, are emitting progressive waves given by
`y_(1)=4 sin 600 pi t`
and `y_(2)=5 sin 608 pi t`
An observer located near these two sources of sound will hear

A

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

B

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

C

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

D

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

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