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When UV light of wavelength 300 ~nm is incident on the metal surface having work function 2.13 eV , electron emission takes place. The stopping potential is: (Given hc =1240 eV nm )

Options

  1. A1.5 ~V
  2. B4.1 ~V
  3. C2 ~V
  4. D4 ~V

Correct answer

C. 2 ~V

Step-by-step solution

aligned & hc - = e . V _ s & 1240 300 eV -2.13 eV = eVs & 4.13 eV -2.13 eV = eVs . & So, V _ s =2 volt aligned

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