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Q.

Waves from two different sources overlap near a particular point. The amplitude and the frequency of the two waves are same. The ratio of the intensity when the two waves arrive in phase to that when they arrive 90o' out of phase is

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a

1 :1

b

2 :2

c

2 ;1

d

4 :1

answer is C.

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Detailed Solution

When the two waves arrive in phase, then resultant amplitude = a+a=2aI1=4a2When the two waves arrive 90o out of phase, then resultant amplitude=a2+a21/2=2⋅a I2=2a2 Now I1I2=4a22a2=21

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