Question

There are headphones on the market that advertise noise cancellation technology. Headphones that eliminate or reduce outside noise have been used for jobs on aircraft carriers and car racing pit crews for a long time. These headphones produce an anti-noise wave that is designed to meet other noise waves. The result is not much more than a faint hiss. Use what you know about the interaction of waves to explain how this is possible.

Answer 1

search for destructive interference