Figure P22.2 shows the apparatus used by Armand H.L.
Fizeau(1819-1896) to measure the speed of light. The basic idea
is tomeasure the total time it takes light to travel from some
point toa distant mirror and back. If d is the distancebetween
the light source and the mirror, and if the transit timefor one
round-trip is t, then the speed of lightis c = 2d/t. To measure
thetransit time, Fizeau used a rotating toothed wheel, which
convertsan otherwise continuous beam of light to a series of
light pulses.The rotation of the wheel controls what an observer
at the lightsource sees. For example, assume that the toothed
wheel in theFizeau experiment has 360 teeth and is rotating at a
speedof 22.5 rev/s when the lightfrom the source is extinguished
-- that is, when a burst of lightpasses through opening A in
Figure P22.2 isblocked by tooth B on return. If the distance
tothe mirror is 9167 m, findthe speed of light. c =  Best
answer:  Answers (1)