The graphs below show the variation of the stopping potential with the frequency ( ) of the…

The graphs below show the variation of the stopping potential $V_S$ with the frequency ($\nu$) of the incident radiations for two different photosensitive materials $M_1$ and $M_2$. Express work function for $M_1$ and $M_2$ in terms of Planck’s constant ($h$) and Threshold frequency and charge of the electron ($e$). If the values of stopping potential for $M_1$ and $M_2$ are $V_1$ and $V_2$ respectively then show that the slope of the lines equals to $\frac{V_1 - V_2}{\nu_{01} - \nu_{02}}$ for a frequency, $\nu > \nu_{02}$ and also $\nu > \nu_{01}$.