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Why should two source of sound have nearly equal frequencies for the formation of beats? |
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Answer» For the formation of distinct beats, frequencies of two sources of sound should be nearly equal, i.e., difference in frequencies of two sources must be small, say less than 10. The impression of sound heard by our ears persists on our mind for 1/10th of a second. If another sound is heard before (1/10) second passes, the impressions of the two sounds mix up and our mind cannot distingush between the two. In order to hear distinct beats, time-interval between two successive beats must be greater than 1/10 second. Therefore, frequency of beats must be less than 10, i.e., number of beats per second, which is equal to difference in frequencies of two sources, must be less than 10. Hence, the two sources should be of nearly equal frequencies. |
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