Question

The frequencies of three tuning forks A, Band C have a relation nA>nB>nC. When the forks A and B are sounded together the number of beats produced is n1 . When A and C are sounded together the number of beats produced is n2, then the number of beats produced when B and C are sounded together is

Answer 1

As described $n_1 =(\nu_A + \nu_B)T, n_2 = (\nu_A + \nu_C)T$ , $\nu_i -$ tuning fork frequencies, T - observation time.

In this case $n = n_1 + n_2 - \frac{2\nu_A(\nu_A + \nu_B)}{n_1}$