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The resultant amplitude of two waves is ...

The resultant amplitude of two waves is given by `R=sqrt(A^2+B^2+2ABcos((2pi)/(lamda)x)`, where A and B are amplitudes of waves and x is the path difference. The value of R is maximum for x=

A

`lamda`

B

x=0

C

`x=3lamda`

D

`x=lamda/2`

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A, B, C
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