Optics Question 249

Question: A star emitting radiation at a wavelength of 5000AA is approaching earth with a velocity of 1.5×106m/s . The change in wavelength of the radiation as received on the earth, is

[CBSE PMT 1995]

Options:

A) 25AA

B) Zero

C) 100AA

D) 2.5AA

Show Answer

Answer:

Correct Answer: A

Solution:

Δλ=λ. vc=1.5×1063×108×5000=25AA

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