_______________ of a material is defined as the minimum amount of the work necessary to remove a free electron from the surface of the material.

_______________ of a material is defined as the minimum amount of the

1.	_______________ of a material is defined as the minimum amount of the work necessary to remove a free electron from the surface of the material.
A.	The electro-repulsive force
B.	The coulomb factor
C.	The power factor
D.	The work function
Answer» E.