Question

Define threshold frequency and stopping potential.

Answer 1

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###Threshold frequency:--
It is the minimum frequency of incident light which can cause the injection of electrons without giving them additional energy.

### stopping potential:---
The amount of potential that is required to stop the electron having maximum kinetic energy from moving is known as stopping potential.

Answer 2

Threshold frequency-it is defined as the minimum frequency of incident light which can cause photoelectric emission i.e this frequency is just able to eject electrons without giving them additional energy

stopping potential- it is defined as the potential necessary to stop any electron from reaching the other side.