Question

Define the term 'threshold frequency' in respect of photoelectric effect.

Answer 1

Threshold frequency is defined as the minimum frequency of incident light which can cause photo electric emission i.e. this frequency is just able to eject electrons with out giving them additional energy.
It is denoted by Vo

Answer 2

'Threshold frequency' in respect of photoelectric effect.

1. Threshold frequency is defined as the minimum frequency of incident light which can cause photo electric emission i.e. this frequency is just able to eject electrons with out giving them additional energy. It is denoted by Vo.

                                                        (OR)

2. If a photosensitive material is given then, threshold frequency is the min. frequency of radiation which would be required for photoelectric emission from the material.