Two tuning forks when sounded together produced 4 beats/sec. The frequency of one fork is 256. The number of beats heard increases when the fork of frequency 256 is loaded with wax. The frequency of the other fork is
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Suppose two tuning forks are named A and B with frequencies 
(known), n B =? (unknown), and beat frequency x = 4 bps.
Frequency of unknown tuning fork may be
or 
It is given that on sounding waxed fork A (fork of frequency 256 Hz) and fork B, number of beats (beat frequency) increases. It means that with decrease in frequency of A, the difference in new frequency of A and the frequency of B has increased. This is possible only when the frequency of A while decreasing is moving away from the frequency of B.
This is possible only if n B = 260 Hz.
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