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Two travelling waves y1=Asin[k(x-ct)] an...

Two travelling waves `y_1=Asin[k(x-ct)]` and `y_2=Asin[k(x+ct)]` are superimposed on string. The distance between adjacent nodes is

A

`c t//pi`

B

`c t//2 pi`

C

`pi //2k`

D

`pi //k`

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The correct Answer is:
D
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