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In acoustics, a beat is an interference between two sounds of slightly different frequencies, perceived as periodic variations in volume whose rate is the difference between the two frequencies. With tuning instruments that can produce sustained tones, beats can readily be recognized. Tuning two tones to a unison will present a peculiar effect: when the two tones are close in pitch but not yet identical, the difference in frequency generates the beating. The volume varies like in a tremolo as the sounds alternately interfere constructively and destructively. When the two tones gradually approach unison, the beating slows down and disappears. Source : Wikipedia 

 
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Keywords
acoustics  interferrance  superposition  
 
 About This Video
 
 Subject Physics
 Category Course Lecture
 Duration moderate
 Views 1913
 Added 26-06-12
 Contributor    A Ghosh
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