A light pointer fixed to one prong of a ...

A light pointer fixed to one prong of a tuning fork touches gnetly a smoked vertical plate. The fork is set vibrating and the plate is allowed to fall freely. 8 complete oscilllations are counted when the plate falls through 10cm.What is the frequency of the tuning fork?

`65 Hz`

`56 Hz`

`46 Hz`

`64 Hz`

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