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Question

A tuning fork of frequency 512 Hz 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
506 Hz
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B
512 Hz
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C
518 Hz
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D
524 Hz
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Solution

The correct option is C 506 Hz
v2 could be 518 Hz or 506 Hz 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 506 Hz.
724842_698214_ans_cdd1e42f679548a6b7d9c158cafbc5dc.jpg

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