Question

Two tuning forks have frequencies 380 and 384 Hz 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//2sec`
B. `1//4sec`
C. `1//8sec`
D. `1//16`sec

Answer 1

Correct Answer - C
beat period `T=(1)/(n_1-n_2)=(1)/(384-380)xx(1)/(4)`sec, Hence minimum time interval between and minima `t=(T)/(2)=(1)/(8)sec`