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A stretched string is in unison with a tuning fork of frequency 392Hz. If the length of the string is decreased by 2% , then the number of beats heard

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A stretched string is in unison with a tuning fork of frequency 392Hz. If the length of the string is decreased by 2% , then the number of beats heard per second will be
A. 2
B. 4
C. 8
D. 16
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Correct Answer - C
`(Deltan)/(n) = (Deltal)/(l_2) therefore (Deltan)/(392)= 2/98 therefore Deltan=8`
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