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2016-03-19T16:44:31+05:30

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Crest of a wave-It is a point on the wave where the displacement of the medium is at a maximum. 
Trough of a wave-It is a point
 on the wave , if the displacement of the medium at that point is at a minimum.
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2016-03-19T16:52:31+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
the major difference between the crest and the trough of a wave is : 

trough : the displacement of the wave from its initial point is minimum. 

crest : the displacement of the wave from its initial point is maximum. 
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