Due to the Doppler effect, the shift in wavelength observed is $0.1 \text{ Å}$ for a star producing a wavelength of $6000 \text{ Å}$. The velocity of recession of the star will be: (in $\text{ km/s}$)

  • A
    $5$
  • B
    $25$
  • C
    $20$
  • D
    $10$

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