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NTA Abhyas NEET2020ChemistryChemical KineticsPractice

What is the binding energy (in J/mol or kJ/mol) of an electron in a metal, whose threshold frequency for photon electron is 2.5 × 1 0 14 s - 1 ?

Options

  1. A99.38 kJ/mol
  2. B1.66 × 1 0 - 19 J/mol
  3. C2.75 × 1 0 - 43 J/mol
  4. D7.22 × 1 0 17 kJ/mol

Correct answer

A. 99.38 kJ/mol

Step-by-step solution

Binding energy of electron = h ν 0 = 6.6 × 1 0 - 34 k g m 2 s - 1 × 2.5 × 1 0 14 s - 1 = 16.5 × 1 0 - 20 J Binding energy of 1 mol e - = 16.5 × 1 0 - 20 J e - 1 × 6.023 × 1 0 23 1 m o l e - = 99.38 × 1 0 3 J/mol = 99.38 kJ/mol

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