Question

A rocket is moving away from the earth at a speed of 6 × 10⁷ m / s . The rocket has blue light in it. What will be the wavelength of light recorded by an observer on the earth (wavelength of blue light = 4600 $\AA$)
(a) $4600 \AA$
(b) $5520 \AA$
(c) $3680 \AA$
(d) $3920 \AA$

Answer 1

I think the answer is option (a).

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