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BITSAT 2014
Exam
BITSAT
Year
2014
Subject
Physics
Chapter
Dual Nature of Matter

BITSAT 2014 · Physics · Dual Nature of Matter

The threshold wavelength of the tungsten is 2300 Ã…. If ultraviolet...

The threshold wavelength of the tungsten is 2300 A~….Ã…. If ultraviolet light of wavelength 1800A~…1800 Ã… is incident on it, then the maximum kinetic energy of photoelectrons would be about -

Options

  1. A1.49eV1.49 \mathrm{eV}
  2. B2.2eV2.2 \mathrm{eV}
  3. C3.0eV3.0 \mathrm{eV}
  4. D5.0eV5.0 \mathrm{eV}

Correct answer

A. 1.49eV1.49 \mathrm{eV}

Step-by-step solution

Kmax⁡=hv−hv0=hc(1λ−1λ0)1.24×10−6(10818−10823)=1.49eV\mathrm{K}_{\max }=\mathrm{hv}-\mathrm{hv}_{0}=\mathrm{hc}\left(\frac{1}{\lambda}-\frac{1}{\lambda_{0}}\right)^{1}.24 \times 10^{-6}\left(\frac{10^{8}}{18}-\frac{10^{8}}{23}\right)=1.49 \mathrm{eV}
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