When UV light of wavelength $300 \mathrm{~nm}$ is incident on the metal surface having work function $2.13 \mathrm{eV}$, electron emission takes place. The stopping potential is: (Given hc $=1240 \mathrm{eV} \mathrm{nm}$ )

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Aicharya · Accepted Answer

$\begin{aligned} & \frac{\mathrm{hc}}{\lambda}-\phi=\mathrm{e} . \mathrm{V}_{\mathrm{s}} \ & \Rightarrow \frac{1240}{300} \mathrm{eV}-2.13 \mathrm{eV}=\mathrm{eVs} \ & \Rightarrow 4.13 \mathrm{eV}-2.13 \mathrm{eV}=\mathrm{eVs} . \ & \Rightarrow 	ext { So, } \quad \mathrm{V}_{\mathrm{s}}=2 \mathrm{volt}\end{aligned}$

When UV light of wavelength $300 \mathrm{~nm}$ is incident on the metal surface having work function $2.13…

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