First slide

Beats

Question

Beats are produced with the help of two sound waves of amplitudes 3 and 5 units. The ratio of maximum to minimum intensity in the beats is

Easy

A

2 : 1
B

5 : 3
C

4 : 1
D

16 : 1

Solution

$\frac{I_{\max}}{I_{\min}} = {(\frac{a_{1} + a_{2}}{a_{1} - a_{2}})}^{2} = \frac{{(5 + 3)}^{2}}{{(5 - 3)}^{2}} = \frac{16}{1}$

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