wave-optics

Question: The wavelength of light observed on the earth, from a moving star is found to decrease by 0.05%. Relative to the earth the star is



1) Moving away with a velocity of $1.5 \times {10^5}m/s$
2) Coming closer with a velocity of $1.5 \times {10^5}m/s$
3) Moving away with a velocity of $1.5 \times {10^4}m/s$
4) Coming closer with a velocity of $1.5 \times {10^4}m/s$
Solution: Explanation: No Explanation
Doppler's Effect of Light

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