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When beats are formed between sound waves of slightly different frequencies, the intensity of the sound heard changes from maximum to minimum in 0.2 s. The difference in frequencies of the two sound waves is (a) 5 Hz (b) 4 Hz (c) 2.5 Hz (d) 2 Hz |
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Answer» Correct Answer is: (c) 2.5 Hz The duration of one beat is from one maximum to the next maximum of intensity. In this case, it is 0.4 s. ∴ the number of beats per second = 2.5 = the difference in frequencies. |
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