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JEE Main 20246 AprilMorning Shift
Exam
JEE Main
Year
2024
Date
6 April
Shift
Morning Shift
Subject
Physics
Chapter
Dual Nature of Matter

JEE Main 2024 · 6 April · Morning Shift · Physics · Dual Nature of Matter

In photoelectric experiment energy of 2.48 eV irradiates a photo...

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 :

Options

  1. A1.68eV1.68 \mathrm{eV}
  2. B2.48eV2.48 \mathrm{eV}
  3. C1.98eV1.98 \mathrm{eV}
  4. D0.5eV0.5 \mathrm{eV}

Correct answer

C. 1.98eV1.98 \mathrm{eV}

Step-by-step solution

eVVs=hν−ϕ0.5V=2.48−ϕ work function (ϕ)=2.48V−0.5V=1.98V\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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