The stopping potential in an experiment on photo electric effect is 1.5V. What is the max K.E of the photo electrons emitted ?

If Vo is the stopping potential,then

eVo=Maximum kinetic energy


Maximum kinetic energy=

  • 19

 The stopping potential is the potential required to stop the most energetic electron, so it may be written as the kinetic energy is balanced by stopping potential.

K.E = e *1.5

        = 2.4 x 10-19

  • 9
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