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What are beats? Define (1) the period of beats (2) beat frequency |
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Answer» A periodic variation in loudness (or intensity) when two sound notes of slightly different frequencies are sounded at the same time is called beats. If two notes of slightly different frequencies n1 and n2 are played simultaneously, the resulting note from their interference has a frequency of (n1 + n2)/2. However, the amplitude of this resulting note varies from the sum to the difference of the amplitudes of the two notes n1 and n2 . An intensity maximum and an intensity minimum are respectively called waxing and waning. Thus, the resulting note will be heard as one of periodic loud (waxing) and faint (waning) sound. One waxing and one waning form one beat. Formation of beats is an example of interference in time. The time interval between successive maxima or minima of sound at a given place is called the period of beats. The number of beats produced per unit time is called the beat frequency. |
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