Beats are observed when two instruments have different. frequencies. The beat frequency for two musical instruments is zero when the two are in tune. Doppler Effect. Doppler effect- the shift in frequency of a wave where the source and observer are moving relative to one another.
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Beats are observed when two instruments have different. frequencies. The beat frequency for two musical instruments is zero when the two are in tune. Doppler Effect. Doppler effect- the shift in frequency of a wave where the source and observer are moving relative to one another.