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0 votes
1.2k views
in Physics by (83.6k points)

lf a star is moving towards the earth, then the spectrum lines are shifted towards

(a) red

(b) infrared

(c) blue

(d) green

1 Answer

+1 vote
by (92.0k points)
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Best answer

Correct option  (c) blue

Explanation:

If a star is moving towards the earth (i.e. observer), the frequency of its radiation will increase or the wavelength will decrease. Therefore the spectrum lines will shift towards blue end of the spectrum.

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