Optics Question 250

Question: A star emitting light of wavelength 5896AA is moving away from the earth with a speed of 3600 km / sec. The wavelength of light observed on earth will

[MP PET 1995, 2002]

Options:

A) Decrease by 5825.25AA

B) Increase by 5966.75AA

C) Decrease by 70.75AA

D) Increase by 70.75AA ( c=3×108m/sec is the speed of light)

Show Answer

Answer:

Correct Answer: D

Solution:

Δλ=νcλ

=3600×1033×108×5896=70.75AA So the increased wavelength of light is observed.

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