Optics Question 257

Question: A star is moving towards the earth with a speed of 4.5×106 m/s. If the true wavelength of a certain line in the spectrum received from the star is 5890AA , its apparent wavelength will be about $

[c=3\times 10^{8}m/s] $ [MP PMT 1999]

Options:

A) 5890AA

B) 5978AA

C) 5802AA

D) 5896AA

Show Answer

Answer:

Correct Answer: C

Solution:

λ=λ(1vc)=5890(14.5×1063×108)

5802AA



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