Beats are produced by two waves given by ${y_1} = a\sin 2000\,\pi t$ and ${y_2} = a\sin 2008\,\pi t$. The number of beats heard per second is
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(c) Number of beats per second = ${n_1}\sim{n_2}$
${\omega _1} = 2000\pi = 2\pi {n_1}$ ==> $n_1 = 1000$
and ${\omega _2} = 2008\pi = 2\pi {n_2} ==> n_2 = 1004$
Number of beats heard per sec $ = 1004 - 1000 = 4$
${\omega _1} = 2000\pi = 2\pi {n_1}$ ==> $n_1 = 1000$
and ${\omega _2} = 2008\pi = 2\pi {n_2} ==> n_2 = 1004$
Number of beats heard per sec $ = 1004 - 1000 = 4$
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