The work function of a metal is \[1.6\times {{10}^{-19}}\]J. When the metal surface is illuminated by the light of wavelength 6400 Å, then the maximum kinetic energy of emitted photo-electrons will be (Planck's constant \[h=6.4\times {{10}^{-34}}Js\]) [MP PMT 1989]

• A.            \[14\times {{10}^{-19}}\ J\]   
• B.            \[2.8\times {{10}^{-19}}\ J\]
• C.            \[1.4\times {{10}^{-19}}J\]     
• D.            \[1.4\times {{10}^{-19}}\,eV\]