[SOLVED] destructive interfrence of waves 1. The problem statement, all variables and given/known data My teacher was saying that if you have a light wave or a sound wave that collided with another wave that was pi out of phase, you get destructive interfrence. If the two wave have the same amplitude, they cancel each other out. I was just wondering where does the energy go after they cancel each other out. 3. The attempt at a solution My guess would be that the energy certainly cannot be destroyed due to the law of conservation of energy. So i would guess the energy changes to heat energy since most 'waste energy' goes into heat energy. But what happens in the microscopic level? If it is a light wave, do the photons just disappear or do they transmit infra-red instead of light? Can anyone check if the stuff i guess are correct? Thank You.