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Due to Doppler effect, the shift in wave...

Due to Doppler effect, the shift in wavelength observed is 0.1 Å, for a star producing a wavelength 6000 Å. The velocity of recession of the star will be

A

20 `km cdot s^(-1)`

B

2.5 `km cdot s^(-1)`

C

10 km `cdot s^(-1)`

D

5 km `cdot s^(-1)`

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