$ y _{2}=a\sin 998\pi t $ The number of beats heard/sec is
[KCET 1998]
A) 0
B) 2
C) 1
D) 4
Correct Answer: C
$ n _{1}=\frac{1000\pi }{2\pi }=500Hz $ and $ n _{2}=\frac{998\pi }{2\pi }=499 $ Hz Hence beat frequency = $ n _{1}-n _{2}=1 $
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