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On sounding tuning fork A with another tuning fork B of frequency 384 Hz ,6 beats are produced per second. After loading the prongs of A with wax and then sounding it again with B , 4 beat are produced per second what is the frequency of the tuning fork A .

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388 Hz

80 Hz

378 Hz

390 Hz

answer is D.

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Detailed Solution

Probable frequency of A is 390 Hz and 378Hz and After loading the beat are decreasing from 6 to 4 so the original frequency of A will be

$n_{2} = n_{1} + x = 384 + 6 = 390 H z$

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