Frequency of fork \(1=200 \,Hz\)
Frequency of fork \(2=200 \pm 4\)
When tape is added frequency of fork \(2\) decreases.
When frequency of fork \(2\) decreases number of beats increases.
Hence we know frequency of fork \(2\) is
\(f_2=200-4=196 \,Hz\)
$ {z_1} = A\sin (kx - \omega \,t) $ , $ {z_2} = A\sin (kx + \omega \,t) $ , $ {z_3} = A\sin (ky - \omega \,t) $ .
($c=$ હવામાં ધ્વનિનો વેગ)