Question

Two tuning forks are sounded simultaneously and a beat of the frequency of 2Hz is heard. If the frequency of the higher pitch is 156Hz, what is the frequency of the other?

Answer 1

$\text{The beat frequency is always equal to the difference between the frequencies}$

$\text{of the two waves, the interference of which led to the appearance of the beat}$

$\delta = f_{max}-f_{min}$

$f_{min} = f_{max}-\delta = 156-2 = 154$

Answer: 154 Hz