Question

31) A star is moving away from the earth with a
velocity of 100 km/s. If the velocity of light is
3x10m/s then the shift of its spectral line of
wavelength 5700 Å due to Doppler's effect will be
A) 5.70 Å
B) 3.80 A
C) 1.90 A
D) 0.63 Å​

Answer 1

Answer:

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