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Interference is a process by virtue of which two or more sound waves interact with each other simultaneously and produce a new resultant wave.
If two sound waves having the same phase and frequency superimpose on each other, their amplitudes are reinforced, and thus resulting in constructive interference.
On the other hand, if two sound waves of the same amplitude are out of phase by 180° and superimpose on each other, it leads to destructive interference, resulting in complete annulment.