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BITSAT 2012
Exam
BITSAT
Year
2012
Subject
Physics
Chapter
Dual Nature of Matter

BITSAT 2012 · Physics · Dual Nature of Matter

A light having wavelength 300 nm fall on a metal surface. The work...

A light having wavelength 300nm300 \mathrm{nm} fall on a metal surface. The work function of metal is 2.54eV2.54 \mathrm{eV}, what is stopping potential?

Options

  1. A2.3V2.3 \mathrm{ V}
  2. B2.59V2.59 \mathrm{ V}
  3. C1.59V1.59 \mathrm{ V}
  4. D1.29V1.29 \mathrm{ V}

Correct answer

C. 1.59V1.59 \mathrm{ V}

Step-by-step solution

Energy of incident radiation is given by: (E=hcλ=6.64∗10−34∗3∗108300∗10−9=\mathrm{E}=\frac{\mathrm{hc}}{\lambda}=\frac{6.64 * 10^{-34} * 3 * 10^{8}}{300 * 10^{-9}}=6.64 * 10^{-19}=4.05 eV\mathrm{eV}) The work function of the metal is equal to (2.54 eV\mathrm{eV}) Hence the maximum kinetic energy of an ejected photoelectron would be (1.59 eV\mathrm{eV}) And the stopping potential needed to stop this would be (1.59  V\mathrm{~V}).
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