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KEAM 2010 Physics and Chemistry Paper
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© examsnet.com
Question : 16
Total: 119
The velocity of a moving galaxy is
300
k
m
s
−
1
and the apparent change in wavelength of a spectral line emitted from the galaxy is observed as 0.5 nm. Then, the actual wavelength of the spectral line is
3000
Å
5000
Å
6000
Å
4500
Å
5500
Å
Validate
Solution:
v
=
300
k
m
/
s
v
=
300
×
10
3
m
/
s
λ
=
0.5
n
m
=
0.5
×
10
−
9
m
,
c
=
3
×
10
8
m
/
s
∴
∆
λ
λ
=
v
c
λ
=
∆
λ
c
v
=
0.5
×
10
−
9
×
3
×
10
8
300
×
10
3
=
5
×
10
−
7
=
5000
Å
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