Optics Question 241

Question: A spectral line λ=5000AA in the light coming from a distant star is observed as a 5200AA . What will be recession velocity of the star

Options:

A) 1.15×107cm/sec

B) 1.15×107m/sec

C) 1.15×107km/sec

D) 1.15 km/sec

Show Answer

Answer:

Correct Answer: B

Solution:

Δλ=5200−5000=200AA Now Δλλ‘=vc⇒v=cΔλλ‘=3×108×2005000

=1.2×107m/sec≈1.15×107m/sec

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