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Dual Nature of Radiation and Matter question

2022 · Q155
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Dual Nature of Radiation and Matter question

2022 · Q155

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1

The light rays having photons of energy 4.2 eV are falling on a metal surface having a work function of 2.2 eV. The stopping potential of the surface is

  1. A
    6.4 V
  2. B
    2 eV
  3. C
    2 V
  4. D
    1.1 V
View written solutionFree

Correct answer: C

We know, $$K{E_{\max }} = hv - h{v_0}$$

$e{V_0} = hv - h{v_0}$ ($\because$ $$K{E_{\max }} = e{V_0}$$)

$$e{V_0} = 4.2\,eV - 2.2\,eV$$

$\therefore$ ${V_0} = 2\,V$

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