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The apparent wavelength of light from a star moving away from the earth is 0.02% more than the actual wavelength. What is the velocity of star ?

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30 km/s

90 km/s

50 km/s

60 km/s

answer is B.

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Detailed Solution

$\frac{Δ λ}{λ} = \frac{V}{C} \frac{0 \cdot 02}{100} = \frac{V}{3 \times 10^{8}} o r V = \frac{0 \cdot 02 \times (3 \times 10^{8})}{100} v = 60 k m / s$

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