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In photoelectric 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. 1.8V
2. 1.2V
3. 0.5V
4. 2.3V

Correct answer: 0.5V

Solution

The stopping potential is equal to the maximum kinetic energy of the emitted electrons divided by the charge of an electron. Since the kinetic energy is 0.5 eV, the stopping potential is 0.5V.

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