Interference of two waves
These two examples represent constructive (left) and destructive interference (right) in wave phenomena. When the two waves are "in phase," their periods are offset by 2nπ*period. However, when they are precisely out of phase, destructive interference results if the phase difference is nπ*period.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"File:Interference of two waves.svg - Wikipedia, the free encyclopedia."
http://en.wikipedia.org/w/index.php?title=File:Interference_of_two_waves.svg&page=1
Wikipedia
CC BY-SA.
