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JIPMER 2006
Exam
JIPMER
Year
2006
Subject
Physics
Chapter
Dual Nature of Matter

JIPMER 2006 · Physics · Dual Nature of Matter

The light rays having photons of energy 1.8 eV are falling on a...

The light rays having photons of energy 1.8 eV are falling on a metal surface having a work function 1⋅2eV1 \cdot 2 \mathrm{eV}. What is the stopping potential to be applied to stop the emitting electrons ?

Options

  1. A3 eV
  2. B1.2 eV
  3. C0.6 eV
  4. D1.4 eV

Correct answer

C. 0.6 eV

Step-by-step solution

Maximum kinetic energy of photoelectron (KE)max⁡=E−ϕ=1.8−1.2=0.6eV i.e., eV0=(KE)max⁡ or eV0=0.6eV\begin{aligned} & (\mathrm{KE})_{\max }=E-\phi \\ & =1.8-1.2 \\ & =0.6 \mathrm{eV} \\ & \text{ i.e., } \quad e V_0=(\mathrm{KE})_{\max } \\ & \text{ or } \quad e V_0=0.6 \mathrm{eV} \\ & \end{aligned}\thereforeStoppingpotentialStopping potentialV_0=0.66\mathrm{eV} .$
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