Constructive Interference:
when a crest from one source meets a crest from another source, the energies combine to displace the medium.
Destructive Interference:
when a crest and trough meet the energies combine to work against eachother, they tend to cancel out.
How do noise canceling headphones use Wave Interference to elimate unwanted sound?
They use destructive interference to cancel out background noise by using noise of its own.
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