Define Threshold frequency,Threshold wavelength,Work function, Stopping potential

Threshold frequency:

•  It is the minimum frequency of light required to eject electrons from a material. 
• If the frequency of light is less than the threshold frequency, the electrons will not be emitted from the material.

Threshold wavelength:

•  It is the longest wavelength of light that can still cause electrons to be ejected from a material. 
• If the wavelength of light is longer than the threshold wavelength, the electrons will not be emitted.

Work function:

•  It is the minimum energy required to remove an electron from a material. 
• It is defined as the energy difference between the energy of an electron at the surface of a material and the energy of an electron at an infinite distance from the material.

 

Stopping potential:

• It is the minimum voltage required to stop the flow of electrons through a material.
• This voltage is related to the work function of the material and the kinetic energy of the electrons. 
• The stopping potential is a measure of the maximum kinetic energy that electrons can have before they are stopped by the material.