Q. 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) $1/2\ sec$
B) $1/4\ sec$
C) $1/8\ sec$
D) $1/16\ sec$
Explanation
(c) Beat period $T = \frac{1}{n_{1}\sim n_{2}} = \frac{1}{384 - 380} = \frac{1}{4}sec.$ Hence minimum time interval between maxima and minima $t = \frac{T}{2} = \frac{1}{8}\sec$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.