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Question

In a photo electric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is
  1. 1.8 V
  2. 1.3 V
  3. 0.5 V
  4. 2.3 V


Solution

The correct option is C 0.5 V
If Vs is the stopping potential, then
Max K.E. = Kmax=eVs
0.5eV=eVsVs=0.5V
 

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