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Stroboscope & frequency of flashing light

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Please help with the following problem.

A stroboscope is a light that flashes on and off at a constant rate. It can be used to illuminate a rotating object, and if the flashing rate is adjusted properly, the object can be made to appear stationary. (a.) What is the shortest time between flashes of light that will make a three-bladed propeller appear stationary when it is rotating with an angular speed of 16.7 rev/s?(b.) What is the next shortest time?

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This solution helps with a problem about stroboscopes and the frequency of a flashing light. It helps determine the shortest time between flashes of light that will make a three-bladed propeller appear stationary while it is rotating.

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Problem: A stroboscope is a light that flashes on and off at a constant rate. It can be used to illuminate a rotating object, and if the flashing rate is adjusted properly, the object can be made to appear stationary. (a.) What is the shortest time between flashes of light that will make a three-bladed propeller appear stationary when it is rotating with an angular ...

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