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Question

Two sound waves of equal intensity I produce beats . The maximum intensity of sound produced in beats will be


A
I
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B
4I
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C
2I
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D
I/2
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Solution

The correct option is B 4I

Given,

Intensity of two sounds is equal i.e. I

Maximum intensity of the beat is given by

$${I_{\max }} = {I_1} + {I_2} + 2\sqrt {{I_1}} \sqrt {{I_2}} $$

$$ \Rightarrow {I_{\max }} = I + I + 2I$$

$$ \Rightarrow {I_{\max }} = 4I$$

hence, the maximum intensity of the beat is 4I

correct answer (B)


Physics

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