Question

Two tuning forks have frequencies 380 and 384 hertz respectively. When they are sounded together, they produce 4 beats. After hearing the maximum sound, how long will it take to hear the minimum sound

• A. 1/2 sec
• B. 1/4 sec
• C. 1/8 sec
• D. 1/16 sec

Answer 1

Answer: (C)

1/8 sec

Answer 2

Beats period = Time interval between two minima

T =$\frac{1}{n_{1} - n_{2}} = \frac{1}{4}\sec$

Time interval between maximum sound and minimum sound = T/2 = 1/8 sec