A tuning fork arrangement (pair) produces 4 beats/sec with one fork...

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A tuning fork arrangement (pair) produces 4 beats/sec with one fork of frequency \( 288 \mathrm{cps} \). A little wax is placed on the
\( \mathrm{P} \) unknown fork and it then produces 2 beats/sec. The frequency of the unknown fork is[KCET 1998; AIEEE 2002]
W
(a). \( 286 \mathrm{cps} \)
(b) \( 292 \mathrm{cps} \)
(c) \( 294 \mathrm{cps} \)
(d) \( 288 \mathrm{cps} \)
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