what is fermi energy?
There are plenty of online resources that will give you a broad overview of this topic. If you have not used one of them, please do so before coming to PF. If you have already done so, then please feel free to post specific questions.
Due to Pauli's exclusion principle, it is not possible for all the electrons in a substance to be in their lowest energy level. Instead they each occupy a different energy level in the substance. So even if the temperature is very low some of the electrons will have fairly high energy that they cannot lose because all the states with lower energy are occupied. There is one state out of all the occupied states that has energy higher than all the other ones (even at low temperatures). The energy of that highest occupied energy state is called the Fermi energy
Thanks.... a lot.Nice ans.
Separate names with a comma.