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Due to Doppler effect, the shift in wavelength observed is $$0.1 A^\circ$$, for a star producing a wavelength $$6000 A^\circ$$. The velocity of recession of the star will be:
$$20 km s^{-1}$$
$$2.5 km s^{-1}$$
$$10 km s^{-1}$$
$$5 km s^{-1}$$
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