JEE Main · 2020 · 04 Sep 2020 · Shift 2 · Modern Physics

Einstein's relation $e{V}_s=\frac{hc}{\lambda }-\varphi$ shows that the plot of stopping potential against $\frac{1}{\lambda }$ is a straight line of slope $\frac{hc}{e}$ with an intercept fixed by the work function, both set purely by the metal and by fundamental constants. Raising the intensity increases the number of photons but not the energy carried by each, so neither the slope nor the intercept changes and the graph stays exactly as it is.