The work function of caesium metal is $2.14$ ev when light of frequency $6 \times 10^4 \;Hz$ is incident on the metal surface , photo emission of electron occur. what is the stopping potential

Question

$\begin{array}{1 1} 3.5\;v \\ 0.35\;ev \\ 0.035 \;v \\ 35 v \end{array} $