Work function of metal surface is $1.6 \times 10^{- 19}$ joule when light of $6400$ A wavelength incident on this surface then maximum kinetic energy of photo electron(in joule) is

14 \times 10^{- 19}

2.8 \times 10^{- 19}

0.14 \times 10^{- 19}

1.5 \times 10^{- 19}

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Work function of metal surface is 1.6×10−19 joule when light of 6400 A wavelength incident on this surface then maximum kinetic energy of photo electron(in joule) is

Work function of metal surface is $1.6 \times 10^{- 19}$ joule when light of $6400$ A wavelength incident on this surface then maximum kinetic energy of photo electron(in joule) is