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An early method of measuring the speed of light makes use of a rotating slotted wheel. A beam of light passes through one of the slots at the outside edge of the wheel, travels to a distant mirror, and returns to the wheel just in time to pass through the next slot in the wheel. One such slotted wheel has a radius of 10.0 cm and 500 slots at its edge. Measurements taken when the mirror was l = 500 m from the wheel indicated a speed of light of 3.0 105 km/s.

(a) What was the (constant) angular speed of the wheel?

rad/s

(b) What was the linear speed of a point on the edge of the wheel?

m/s

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Category:- Physics
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