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Two waves of the same frequency and same...

Two waves of the same frequency and same amplitude 'a' are reaching a point simultaneously. What should be the phase difference between the waves so that the amplitude of the resultant wave be :
(i) 2a (ii) `sqrt2a` (iii) a (iv) zero.

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The correct Answer is:
`2pi//3`
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CENGAGE PHYSICS ENGLISH-SUPERPOSITION AND STANDING WAVES-Fill in the Blanks Type
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