Frequency of tuning fork \( \mathrm{A} \) is \( 256 \mathrm{~Hz} \). It produces P four beats/se...

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Frequency of tuning fork \( \mathrm{A} \) is \( 256 \mathrm{~Hz} \). It produces
P four beats/sec with tuning fork \( B \). When wax is applied at tuning fork B then 6 beats/sec are heard. Frequency of \( B \) is :
(1) 252
(2) \( 260 \mathrm{~Hz} \)
(3) (1) \& (2) both
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