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Two vibrating tuning forks producing wav...

Two vibrating tuning forks producing waves given by `y_(1) = 27 "sin" 600 pi t "and" y_(2) = 27 "sin" 604 pi t` are held near the ear of a person, how many beats will be heard in three seconds by him ?

A

4

B

2

C

6

D

12

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