A rocket is going away from the earth at a speed of 10⁶ m/s.If the wavelength of the light wave emitted by it be
5700 A, what will be its Doppler's shift

• A

  ,$200\text{Å}$

• B

  $19\text{Å}$

• C

  $20\text{Å}$

• D

  $0\cdot 2\text{Å}$