Define threshold frequency, work function and stopping potential with�

1.	Define threshold frequency, work function and stopping potential with reference to photoelectric effect.
Answer» Threshold frequency : The minimum frequency of incident light for a metal surface, below which the incident light can not eject electrons, is called threshold or cut off frequency for that metal surface. Work function: The minimum amount of energy required to eject an electron from a surface without imparting any kinetic energy is called work function of the sufrace. Stopping potential : The value of negative potential of the collector corresponding to which even the fastest photo electrons are repelled back, is called stopping potential. It is also defined as the minimum value of opposing potential difference required as to just stop the photo electrons emitted with maximum kinetic energy. It is also called cut off potential.

Define threshold frequency, work function and stopping potential with reference to photoelectric effect.

Answer»

Threshold frequency : The minimum frequency of incident light for a metal surface, below which the incident light can not eject electrons, is called threshold or cut off frequency for that metal surface.

Work function: The minimum amount of energy required to eject an electron from a surface without imparting any kinetic energy is called work function of the sufrace.

Stopping potential : The value of negative potential of the collector corresponding to which even the fastest photo electrons are repelled back, is called stopping potential. It is also defined as the minimum value of opposing potential difference required as to just stop the photo electrons emitted with maximum kinetic energy. It is also called cut off potential.

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