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Q.

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. 8 compete oscillations are counted, when the plate falls through 10 cm. The frequency of the tuning fork is

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a

82Hz

b

66Hz

c

56Hz

d

72Hz

answer is D.

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Detailed Solution

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t=2hg=17sec  Frequency =7×8=56Hz

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