In an experiment of photoelectric effect the stopping potential was measured to be $V_1 and V_2$ with incident light of wavelength $\lambda$ and $\lambda /2$, respectively. The relation between $V_1 and V_2$ is :

$\begin{array}{l}\frac{hc}{\lambda }=W+e{V}_1----\left(1\right)\\ \frac{hc}{\lambda /2}=W+e{V}_2----\left(2\right)\\ 2W+2e{V}_1=W+e{V}_2\Rightarrow V_2=\frac{W}{e}+2V_1\\ V_2>2V_1\end{array}$