Light has dual nature. Which nature is supported by photoelectric effect?

In the figure shown, two monochromatic radiations of intensities ${\mathrm{I}}_1$ and ${\mathrm{I}}_2$ a $\left({\mathrm{I}}_1>{\mathrm{I}}_2\right)$ having the same frequency are in turns incident on a photo sensitive surface causing photo electric emission. Curve $\mathrm{A}$ and $\mathrm{B}$ show the variation of photo electric current with accelerating potential. Identify the curves representing radiation with intensity ${\mathrm{I}}_1$ and ${\mathrm{I}}_2$ giving reason. Also give reason why the two curves have the same stopping potential ${\mathrm{V}}_0$.