When a stationary wave is formed, then its frequency is that of the individual waves.

same as

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twice

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half

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Solution

The correct option is A same as
If $Y_{i n c i d e n t}$ =A Sin(ωt−kx)
Then $Y_{s t a t i o n a r y}$ =A Cos(kx)Sin(ωt)
It is clear that frequency of both is same.

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[NCERT 1983]

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