Consider two harmonic sound waves of angular frequencies of ω 1 and ω 2. These periodic variations of sound are called beats.īeats are observable when the difference between the frequencies of sources is smaller. When two sounds of nearly different frequencies reach our ears simultaneously, the frequency of the combined sound will be the average of frequencies of 2 sound waves, and we hear periodic variations in the sound. Here, constructive interference and destructive interference of sound waves happen periodically. If we strike two tuning forks with slightly different frequencies, we hear the resultant sound as the intensity of the sound changes periodically. In the case of sound waves, you will not hear sound during the destructive interference of waves.įigure: Constructive and destructive interference Beats In destructive interference, the amplitude of the resultant wave results in 0. In the case of sound waves, you will hear sound with maximum loudness during constructive interference of two sounds. When we add waves with equal amplitude and equal frequency at each point, we get maximum amplitude. In this case, we are dealing with waves of same frequency. Superposition is the basis of interference. This is known as the superposition theorem. When two waves (Y 1 and Y 2 ) meet in a given space and time, resultant waves are obtained by simply adding displacements at each location. To demonstrate the phenomenon of beats produced by two tuning forks of slightly different frequencies.
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