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when two waves superimposed on each other in the same phase (phase diff is 0), then the resultant amplitude becomes the sum of the amplitudes of the two waves. This type of interference is called constructive interference. on the other hand, when two waves superimposed on each other in the opposit phase (phase diff is 180 degree), then the resultant amplitude becomes the difference of the amplitudes of the two waves. This type of interference is called destructive interference.

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Q: What are constructive interference and destructive interference?
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