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Dual Nature of Radiation and Matter question

2010 · Q154
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Dual Nature of Radiation and Matter question

2010 · Q154

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work functions 5.01 eV, when ultraviolet light of 200 nm falls on it, must be
  1. A
    2.4 V
  2. B
    −-− 1.2 V
  3. C
    −-− 2.4 V
  4. D
    1.2 V
View written solutionFree

Correct answer: B

According to Einstein’s photoelectric equation

eVs = hν\nu ν - ϕ\phi ϕ

⇒\Rightarrow⇒ eVs = hcλ{{hc} \over \lambda }λhc​ - ϕ\phi ϕ

= 1240200{{1240} \over {200}}2001240​ - 5.01

= 6.2 eV – 5.01 eV = 1.2 eV

Stopping potential, Vs = 1.2 V

The potential difference that must be applied to stop photoelectrons = – Vs = – 1.2 V

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