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Dual Nature of Radiation and Matter question

2008 · Q139
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Dual Nature of Radiation and Matter question

2008 · Q139

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the
  1. A
    infrared region
  2. B
    X-ray region
  3. C
    Ultraviolet region
  4. D
    Visible region
View written solutionFree

Correct answer: C

ϕ\phi ϕ = 6.2 eV.

Kmax = 5 eV;


∴\therefore∴ hν\nu ν = 11.2 eV = E

∴\therefore∴ λ\lambda λ = hcE{{hc} \over E}Ehc​ = 1240011.2{{12400} \over {11.2}}11.212400​ = 1107 Ao\mathop A\limits^o Ao​

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