# NEET Physics Waves Questions Solved

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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

(1) $\frac{1}{2}$sec

(2) $\frac{1}{4}$sec

(3) $\frac{1}{8}$sec

(4) $\frac{1}{16}$sec

(3) Beat period $T=\frac{1}{{n}_{1}~{n}_{2}}=\frac{1}{384-380}=\frac{1}{4}\mathrm{sec}$.

Hence minimum time interval between maxima and minima $t=\frac{T}{2}=\frac{1}{8}\mathrm{sec}.$

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