Question

If an electron recieves 10eV. energy and wastes 3 eV in overcoming the work function then find the potential that will stop the electron from striking the collector plate.

• A. 3 V
• B. 5 V
• C. 7 V
• D. 10 V

Answer 1

The correct option is C 7 V

If the electron recieves 10 eV. energy and wastes 3 eV. in overcoming the work function then it comes out with 7eV energy. To stop an electron with 7eV. energy we need to provide 7 V of stopping potential.