Question

A star is moving away from the earth with a velocity of 100 km/s. If the velocity of light is 3 × 10⁸ m / s then the shift of its spectral line of wavelength $5700 \AA$ due to Doppler's effect will be
(a) $0.63 \AA$
(b) $1.90 \AA$
(c) $3.80 \AA$
(d) $5.70 \AA$

Answer 1

I think the answer is option ( d ).

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