Answer:
The maximum kinetic energy of the photo-electron is \[{{K}_{\max }}=\frac{hc}{\lambda }-\frac{hc}{{{\lambda }_{0}}}=hc\left( \frac{{{\lambda }_{0}}-\lambda }{\lambda {{\lambda }_{0}}} \right)\] (i) When \[\lambda >{{\lambda }_{0}},\]the kinetic energy of the photo- electron is negative. The photo-electric emission does not occur. (ii) When\[\lambda <{{\lambda }_{0}}\], the kinetic energy of the electron is positive. The photo-electric emission will occur.
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