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NEET 2022
Exam
NEET
Year
2022
Subject
Physics
Chapter
Dual Nature of Matter

NEET 2022 · Physics · Dual Nature of Matter

The light rays having photons of energy 4.2 eV are falling on a...

The light rays having photons of energy 4.2eV4.2 \mathrm{eV} are falling on a metal surface having a work function of 2.2eV2.2 \mathrm{eV}. The stopping potential of the surface is:

Options

  1. A2eV2 \mathrm{eV}
  2. B2 V2 \mathrm{~V}
  3. C1.1 V1.1 \mathrm{~V}
  4. D6.4 V6.4 \mathrm{~V}

Correct answer

B. 2 V2 \mathrm{~V}

Step-by-step solution

By Einstein photoelectric equation, we have;  K.E. =hv−ϕeV0=4.2eV−2.2eVeV0=2eV=2 volt \begin{aligned} \text{ K.E. } & =h v-\phi \\ e \mathrm{ V}_0 & =4.2 \mathrm{eV}-2.2 \mathrm{eV} \\ e \mathrm{ V}_0 & =2 \mathrm{eV}=2 \text{ volt } \end{aligned}
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