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JEE Main201815 Apr 2018Morning ShiftChemistryStructure of AtomActual

Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying 0.5 ~V when the radiation of 250 ~nm is used. The work function of the metal is :

Options

  1. A4 ~eV
  2. B5.5 ~eV
  3. C4.5 ~eV
  4. D5 ~eV

Correct answer

C. 4.5 ~eV

Step-by-step solution

=250 ~nm =2500 Å E = hc = 12400 2500 =4.96 ~eV KE = stopping potential =0.5 ~eV E = W ₀+ K . E . 4.96= W ₀+0.5 ~W ₀=4.46 4.5 ~eV

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