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JEE Main2009PhysicsDual Nature of MatterActual

The surface of a metal is illuminated with the light of 400 ~nm . The kinetic energy of the ejected photoelectrons was found to be 1.68 eV . The work function of the metal is ( hc =1240 eV nm )

Options

  1. A3.09 eV
  2. B1.41 eV
  3. C151 eV
  4. D1.68 eV

Correct answer

B. 1.41 eV

Step-by-step solution

aligned & 1 2 mv ^2= eV _ o =1.68 eV hv = hc = 1240 evnm 400 ~nm =3.1 eV 3.1 eV = W ₀+1.6 eV & W ₀=1.42 eV aligned

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