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  • Given figure shows few data points in a photo electric efferct experiment for a certain metal. The minimum energy  (in eV ) for ejection of electron from its surface is: (Plank's constant h =

Given figure shows few data points in a photo electric efferct experiment for a certain metal. The minimum energy  (in eV ) for ejection of electron from its surface is: (Plank's constant h = 6.62\times 10^{-34}J.s)
Option: 1 2.27
Option: 2 2.59
Option: 3 1.93
Option: 4 2.10

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\begin{array}{l} \quad h v=\phi+\mathrm{eV}_{\mathrm{s}} \\ \text { at B, } \ \ \ \mathrm{V}_{\mathrm{s}}=0, \quad v=5.5 \\ \\ \Rightarrow \quad \mathrm{h} \times 5.5 \times 10^{14}=\phi \\\\ \phi=\frac{6.62 \times 10^{-34} \times 5.5 \times 10^{14}}{1.6 \times 10^{-19}} \mathrm{eV}=2.27 \mathrm{eV} \end{array}

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