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A standing wave in a pipe with a length ...

A standing wave in a pipe with a length `L = 1.2 m` is described by
`y(x,t) = y_(0)sin[(2pi//L)x]sin[(2pi//L)x+pi//4]`
Based on above information, which one of the following statements is incorrect. (Speed of sound in air is `300 ms^(-1)`)–

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