You attempt to reproduce the experiment done by Fizeau by using a wheel with 720 equally spaced teeth. You find that if you rotate the wheel at 22 rotations per second, that the light becomes visible. The time it takes for consecutive teeth to pass by is equal to us. Noting that the mirror is 8.63 km away, this gives a speed of light equal to 108 m/s. X
You attempt to reproduce the experiment done by Fizeau by using a wheel with 720 equally spaced teeth. You find that if you rotate the wheel at 22 rotations per second, that the light becomes visible. The time it takes for consecutive teeth to pass by is equal to us. Noting that the mirror is 8.63 km away, this gives a speed of light equal to 108 m/s. X
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Transcribed Image Text:The apparatus used by Fizeau to measure the speed of light is shown below. Note the
8.63 km distance between the source and the reflecting mirror.
Observer
Lens
Lens
Light source
Semitransparent
mirror
B
Lens
с
Rotating toothed wheel
Lens
A
Reflecting plane mirror
(8.63 km from light source)
You attempt to reproduce the experiment done by Fizeau by using a wheel with 720
equally spaced teeth. You find that if you rotate the wheel at 22 rotations per second, that
the light becomes visible.
The time it takes for consecutive teeth to pass by is equal to
μs.
Noting that the mirror is 8.63 km away, this gives a speed of light equal to
108 m/s.
X
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