wave-optics

Question: A star is moving towards the earth with a speed of $4.5 \times {10^6}$m/s. If the true wavelength of a certain line in the spectrum received from the star is 5890 Å, its apparent wavelength will be about $[c = 3 \times {10^8}m/s]$



1) 5890 Å
2) 5978 Å
3) 5802 Å
4) 5896 Å
Solution: Explanation: No Explanation
Doppler's Effect of Light

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