A light pointer fixed to one prong of a tuning fork touches a verti...

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A light pointer fixed to one prong of a tuning fork touches a vertical plate. The fork is set vibrating and the plate is allowed to fall freely. Eight complete oscillations are counted when the plate falls through
\( \mathrm{P} \) \( 10 \mathrm{~cm} \), then the frequency of the fork is: \( \left(\mathrm{g}=9.8 \mathrm{~m} / \mathrm{s}^{2}\right) \)
(A) \( 65 \mathrm{~Hz} \)
(B) \( 56 \mathrm{~Hz} \)
(C) \( 46 \mathrm{~Hz} \)
(D) \( 64 \mathrm{~Hz} \)
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