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Theory
Constructive and destructive interference can be measured as a function of time not just space
A beat is the change in amplitude caused by two or more waves with different frequencies
The amount the amplitude changes is relative to the difference in the frequencies of the individual sound waves.
Theory
As shown in the figure, theBlue and red waves are creatingconstructive and destructiveinterference resulting in thegreen wave, which is the amplitudewe hear.