Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

This question already has an answer here:

Hi is there any possibility that you located between 2 sound sources and u hear nothing? as we know 2 wave in opposite direction will destroy each other...

share|cite|improve this question

marked as duplicate by John Rennie, DavePhD, Kyle Oman, Brandon Enright, Colin McFaul Jun 11 '14 at 17:27

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

This is the principle of noise-cancelling devices – Jim Jun 11 '14 at 13:35
up vote 2 down vote accepted

Yes, this is exactly how noise suppression headphones operate, works like charm,

share|cite|improve this answer

When you get two waves to interfere with each other, then there is no reflection. Usually, you use a quarter-wavelength reflection to get this result. The energy is usually passed off as heat, i imagine, but 4 W of heat is like a calorie per hour.

Two waves travelling in opposite directions will add one over the other, so you will get some sort of standing wave which is set by the phase difference between the waves. In this case, the sounds still exist, and will escape out of the thing.

share|cite|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.