First slide

Beats

Question

The beats are produced by two sound sources of same amplitude and of nearly equal frequencies. The maximum intensity of beats will be ...... that of one source

Moderate

A

Same
B

Double
C

Four times
D

Eight times

Solution

Intensity $\propto$ (amplitude)²
as $A_{\max} = 2 a_{o}$ (a_o= amplitude of one source) so $I_{\max} = 4 I_{o}$ .

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