A tuning fork of frequency 512Hz is vibrated with a sonometer wire and 6 beats per second are heard. The beat frequency reduces if the tension in the string is slightly increased. The original frequency of vibration of the string is
A
506Hz
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B
512Hz
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C
518Hz
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D
524Hz
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Solution
The correct option is C506Hz v2 could be 518Hz or 506Hz for 6 beats/ second. If the tension of the sonometer wire is slightly increased, v2 increases, but the beat reduces, therefore the original frequency of the string is 506Hz.