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Which two of the given transverse waves ...

Which two of the given transverse waves will give stationary waves when get superimposed
` z_(1) =a cos (kx- omega t) " " .....(A)`
` z_(2) =a cos (kx+ omega t) " " .....(B)`
` z_(3) =a cos (ky- omega t) " " .....(C)`

A

1 and 2

B

2 and 3

C

1 and 3

D

none of the above

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The correct Answer is:
D
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