Evaluate the period of the vibrating object, Physics

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Q. A twelve-slit strobe disc is rotated at the max stopping frequency for a vibrating object. The strobe is rotated at 4.0 Hz.

(a) Evaluate the period of the vibrating object?

(b) If every second slit is covered with tape, how fast could the strobe now have to be rotated to "stop" the same object?

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