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31. We apply Eq. 3736 for the Doppler shift in wavelength:
∆λ
λ
=
v
c
where
v
is the recessional speed of the galaxy. We use Hubble’s law to find the
recessional speed:
v = Hr
, where
r
is the distance to the galaxy and
H
is the Hubble
constant
()
3
m
sly
21.8 10
.
−
⋅
×
Thus,
( )
38
6
21.8 10
m/s ly
2.40 10 ly
5.23 10 m/s
v
−
=×
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This note was uploaded on 05/19/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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