The random motion of holes and free electrons due to thermal agitation is called_________
Right Answer is:
The random motion of holes and free electrons due to thermal agitation is called diffusion.
⇒ If you spray some perfume in one corner of your room you immediately feel its effect from other corners because of ‘flow’ due to the concentration gradient.
⇒ This is applicable for electrons and holes in a semiconductor also. They move from the region of higher concentration to the region of lower concentration.
⇒ In the same way, the holes and free electrons diffuse throughout a semiconductor.
⇒ This movement by diffusion is a random movement and is due to the energy of the electrons.
⇒ The drive which causes diffusion is the thermal agitation of the atoms or molecules or electrons and holes. Hence, this is why thermal agitation is called diffusion.