Optics Question 250

Question: A star emitting light of wavelength $ 5896{AA} $ 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 $ 5825.25{AA} $

B) Increase by $ 5966.75{AA} $

C) Decrease by $ 70.75{AA} $

D) Increase by $ 70.75{AA} $ ( $ c=3\times 10^{8}m/\sec $ is the speed of light)

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Answer:

Correct Answer: D

Solution:

$ \Delta \lambda =\frac{\nu }{c}\lambda $

$ =\frac{3600\times 10^{3}}{3\times 10^{8}}\times 5896=70.75{AA} $ So the increased wavelength of light is observed.



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