27. 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
m
21.8 10
2.40 10 ly
5.23 10 m s
v
−
⋅
ªº
=×
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This note was uploaded on 01/23/2011 for the course ＰＨＹ 214 taught by Professor Timothybolton during the Fall '10 term at Kansas State University.
 Fall '10
 TimothyBolton

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