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if the energy of a photon is 25 eV and work function of the material is 7 eV ,then find the value of stopping potential.

if the energy of a photon is 25 eV and work function of the material is 7 eV ,then find the value of stopping potential.

Grade:8

2 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
7 years ago
The energy of the photon incident on the metal surface is 25 eV out of which 7 eV is used for knocking out the electron, the rest 18 eV goes into being the KE of the emitted electron. So atleast 18 V of potential is applied to stop the electron and hence the stopping potential is 18V.
ohysh
13 Points
one year ago
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