Speed of a galaxy from the shift in wavelength of its light

1. A.
   $3 \times 10^{5}\text{ }m{\text{ }s}^{- 1}$
2. B.
   $4 \times 10^{5}\text{ }m{\text{ }s}^{- 1}$
3. C.
   $6.25 \times 10^{5}\text{ }m{\text{ }s}^{- 1}$
4. D.
   None

Tap an option to check your answer.

1. A.
   $3 \times 10^{8}{\text{ }ms}^{- 1}$
2. B.
   $3 \times 10^{10}{\text{ }ms}^{- 1}$
3. C.
   $3.13 \times 10^{5}{\text{ }ms}^{- 1}$
4. D.
   $4.48 \times 10^{5}{\text{ }ms}^{- 1}$

Tap an option to check your answer.