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What is interference?
When two or more waves overlap and combine to form a new wave thisprocess is called interference. When two (or more) waves travel simultaneously in the same medium,the total …disturbance in the medium is at each point the vectorialsum of the individual disturbances produced by each wave. Thisphenomenon is called interference . For example, if two waves are in phase, they addso that the wave disturbance at each point in space is increased.This is called constructive interference . If two waves are out of phase by180°, the wave disturbance in the propagating medium is reduced.This is called destructive interference. If the magnitudes of twoout-of-phase waves are the same, the wave disturbance is completelycanceled A special type of interference is produced by two waves of the samefrequency and magnitude traveling in opposite directions. Theresultant wave pattern is stationary in space and is called a standing wave . Such standing sound waves are formed in hollowpipes such as the flute. It can be shown that, in a givenstructure, standing waves can exist only at specific frequencies,which are called resonant frequencies . For two (or more) waves to interfereconstructively or destructively the phase of one wave with respectto the other must be well defined in time and space. In other wordsthe phase of the disturbances produced by the waves must becorrelated in time and space. Sets of waves exhibiting suchcorrelation are referred to as coherent . getting invold in other people's business ( Full Answer )