Wave phenomena part 1

constructive inference:  when crest from one source meets a crest from another source, energy combine to displace the medium. Something occurs when trough meets through.

destructive inference: when a crest and trough meet, the energies combine to work against each other. they tend to cancel each other.

standing waves: when interfering waves have the same amplitude and wavelength, so the resultant interference pattern remains nearly stationary.

The answer to the question: Destructive inference because those headphones produce the necessary sound waves and add them to the headphone, therefore, they cancel the disturbing sound.

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