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
The correct option is C Four
Number of beats per second $$=n_1\sim n_2$$
$$\omega_1=2000\pi =2\pi n_1$$
$$\Rightarrow n_1=1000$$ and $$\omega_2=2008\pi =2\pi n_2$$
Number of beats heard per second $$=1004-1000=4$$.