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238
CHAPTER 22
Problem Solutions
22.1
The total distance the light travels is
Therefore,
()
866
2
2 3.84
10
6.38
10
1.76
10
m
7.52
10 m
center to
Earth
Moon
center
dD
R R
∆=
−
−
=×
−
×
−
× =
×
8
8
8
7.52
3.00
10 m s
2.51 s
d
v
t
∆×
==
=
×
∆
22.2
If the wheel has 360 teeth, it turns through an angle of
1
in the time it takes the
light to make its round trip. From the definition of angular velocity, we see that the time
is
720 rev
( )
5
1720 rev
5.05
10
s
27.5 rev s
t
θ
ω
−
=
×
Hence, the speed of light is
( )

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