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The work function of a metal is 4.2eV. I...

The work function of a metal is 4.2eV. If the radiation of `2000Å` falls on the metal, find the kinetic energy of the metal

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Work function`E_(0)=hv_(0)=4.2eV=4.2xx1.602xx10^(-19)J=6.728xx10^(-19)J`
  Energy (E) is given as `E=hv=(hc)/(lambda)=(6.626xx10^(-34)Jxx3.0xx10^(8)ms^(-1))/(2000xx10^(-10)m)=9.939xx10^(-19)J`
Kinetic energy, KE `=E-E_(0)=[9.939xx10^(-19)J-6.728xx10^(-19)J]=3.211xx10^(-19)J`
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