Question

In the spectrum of light of a luminous heavenly body the wavelength of a spectral line is measured to be 4747 Å while actual wavelength of the line is 4700 Å. The relative velocity of the heavenly body with respect to earth will be
(velocity of light is 3 × 10⁸ m / s )
(a) 3 × 10⁵ m / smoving towards the earth
(b) 3 × 10⁵ m / smoving away from the earth
(c) 3 × 10⁶ m / smoving towards the earth
(d) 3 × 10⁶ m / smoving away from the earth

Answer 1

(d) 3 × 10⁶ m / s moving away from the earth

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