Interference
Interference is the interaction of two or more waves. Wave motion is a common phenomenon in everyday life. Light and sound, for example, are transmitted by waves. In addition, waves can often be seen on lakes, ponds, and other bodies of water.
All waves have high points, called crests, and low points, called troughs (pronounced trawfs). Suppose that two or more waves are generated at the same time, as shown in the accompanying photograph. Here, water waves are spreading out from the point where pebbles have been dropped into a pond. You can see how the waves overlap each other at various points on the surface of the water. This overlapping effect is interference.
Constructive and destructive interference
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