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The graph of stopping potential $\left({\mathrm{V}}_s\right)$ against frequency $(v)$ of incident radiation is plotted for two different metals 'P' and 'Q' as shown in the graph. ${\varphi }_{\mathrm{p}}$ and ${\varphi }_{\mathrm{q}}$ are work functions of $\mathrm{P}$ and $\mathrm{Q}$ respectively, then