Dual Nature of Matter

JEE Main level, single correct, medium

114 of 200

Question 114 of 200

In photoelectric experiment energy of 2.48eV2.48 \mathrm{eV} irradiates a photo sensitive material. The stopping potential was measured to be 0.5 V0.5 \mathrm{~V}. Work function of the photo sensitive material is :

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Answer: (C) 1.98eV1.98 \mathrm{eV}

eVVs=hν−ϕ0.5 V=2.48−ϕ work function (ϕ)=2.48 V−0.5 V=1.98 V\begin{aligned} & \mathrm{eV} \mathrm{V}_{\mathrm{s}}=\mathrm{h} \nu-\phi \\ & 0.5 \mathrm{~V}=2.48-\phi \\ & \text { work function }(\phi)=2.48 \mathrm{~V}-0.5 \mathrm{~V}=1.98 \mathrm{~V}\end{aligned}

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