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Three waves of equal frequency having am...

Three waves of equal frequency having amplitudes 10 mm, 4 mm and 7 mm superpose at a given point with successive phase difference of `pi`/2 . The amplitude of the resulting wave in mm is given by

A

`7`

B

`6`

C

`5`

D

`4`

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The correct Answer is:
C
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RESONANCE ENGLISH-WAVE ON STRING -Exercise- 1 PART II
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