Due to the Doppler effect,the shift in wavelength observed is $0.1\;\mathring{A}$,for a star producing a wavelength of $6000\;\mathring{A}$. The velocity of recession of the star will be ....... $km/s$.

  • A
    $2.5$
  • B
    $10$
  • C
    $5$
  • D
    $20$

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