A) \[4\,\,hv\]
B) \[3\,\,hv\]
C) \[5\,\,hv\]
D) \[\frac{5}{2}\,\,hv\]
Correct Answer: B
Solution :
From Einstein's photoelectric equation the maximum kinetic energy of photoelectrons emitted from metal surface is given by \[{{E}_{k}}=h{{v}_{1}}-W\] where W is work function of metal. Given, \[W=hv\]and \[{{v}_{1}}=4v\] \[\therefore \] \[{{E}_{k}}=4hv-hv=3hv\]
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