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23 Nov 2019
To measure the speed of light, Fizeau used a rotating diskwithequally spaced holes through which light could pass. Lightwasdirected at the rotating disk, passed through one of theholes,bounced from a distant mirror, and then the angular speed ofthewheel was adjusted until the returning beam of light passedthroughthe next hole in the disk. In one such experiment, the wheelisspun at 1000 rpm and the mirror is 18 km away. If the speedoflight is 3.00 x 108 m/s, what is the requiredangularspacing between the holes so the returning light will passthroughthe next hole?
To measure the speed of light, Fizeau used a rotating diskwithequally spaced holes through which light could pass. Lightwasdirected at the rotating disk, passed through one of theholes,bounced from a distant mirror, and then the angular speed ofthewheel was adjusted until the returning beam of light passedthroughthe next hole in the disk. In one such experiment, the wheelisspun at 1000 rpm and the mirror is 18 km away. If the speedoflight is 3.00 x 108 m/s, what is the requiredangularspacing between the holes so the returning light will passthroughthe next hole?
