In hydrogen spectrum the wavelength of \[{{H}_{\alpha }}\] line is 656 nm whereas in the spectrum of a distant galaxy, \[{{H}_{\alpha }}\] line wavelength is 706 nm. Estimated speed of the galaxy with respect to earth is [IIT-JEE 1999; UPSEAT 2003]

• A.            \[2\times {{10}^{8}}m/s\]      
• B.            \[2\times {{10}^{7}}m/s\]
• C.            \[2\times {{10}^{6}}m/s\]      
• D.            \[2\times {{10}^{5}}m/s\]