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 appear stationary.
(i) Determine the shortest time between flashes of light which will make a three-bladed propeller appear stationary if it is rotating with an angular speed of 25.7 rev/s?
(ii) Determine the next shortest time?