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Q.

The superposition takes place between two waves of frequency f and amplitude a. The total intensity is directly proportional to

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a

a

b

2a

c

2a2

d

4a2

answer is D.

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Detailed Solution

Resultant amplitude A=a2+a2+2aacosφ=4a2cos2 φ2∵n=pv2l⇒I∝4a2
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