A star is moving away from Earth and shift in spectral line of wavelength 5700 Å is 1.90 Å . Velocity of the star is

Question

A star is moving away from Earth and shift in spectral line of wavelength 5700 Å is 1.90 Å . Velocity of the star is, 50 k m s - 1, 70 k m s - 1, 85 k m s - 1, 100 k m s - 1

MARKS App · Accepted Answer

∆ λ = υ c λ ∴ υ = c ∆ λ λ Or υ = 3 × 10 8 × 1.9 × 10 - 10 5700 × 10 - 10 = 100 k m s - 1

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