A stroboscope is a light which flashes on and off at a constant rate. This can be employed to illuminate a rotating object, and if the flashing rate is adjusted correctly, the object can be made to emerge stationary.
(i) Find out the shortest time between flashes of light which will make a three-bladed propeller appear stationary when it is rotating with the angular speed of 16.7 rev/s?
(ii) Find out the next shortest time?