First slide

Beats

Question

Two waves $y = 0 .25 \sin 316 t$ and $y = 0 .25 \sin 310 t$ are travelling in same direction. The number of beats produced per second will be

Easy

A

6
B

3
C

$3 / π$
D

$3 π$

Solution

$n_{1} = \frac{316}{2 π}$ and $n_{2} = \frac{310}{2 π}$ . Number of beats heard per second = n₁ – n₂ = $\frac{316}{2 π} - \frac{310}{2 π} = \frac{3}{π}$

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