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(A) In a wave,a crest represents the point of maximum positive displacement,and the subsequent trough represents the point of maximum negative displac

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$\pi \ rad$

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(A) In a wave,a crest represents the point of maximum positive displacement,and the subsequent trough represents the point of maximum negative displacement.These two points are separated by half a wavelength,which corresponds to a distance of $\frac{\lambda}{2}$.Since a full wavelength $\lambda$ corresponds to a phase change of $2\pi \ rad$,a distance of $\frac{\lambda}{2}$ corresponds to a phase difference of $\frac{2\pi}{2} = \pi \ rad$.

What is the phase difference between consecutive crest and trough?

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