Optics Question 253

Question: Light coming from a star is observed to have a wavelength of 3737 Å, while its real wavelength is 3700 Å. The speed of the star relative to the earth is

[Speed of light 3×108m/s ] [MP PET 1997]

Options:

A) 3×105m/s

B) 3×106m/s

C) 3.7×107m/s

D) 3.7×106m/s

Show Answer

Answer:

Correct Answer: B

Solution:

Δλ=λvc

⇒(3737−3700)=3700×v3×108⇒v=3×106m/s

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