Question:
When an electric field is applied across a semiconductor
(a) electrons move from lower energy level to higher energy level in the conduction band
(b) electrons move from higher energy level to lower energy level in the conduction band
(c) holes in the valence band move from higher energy level to lower energy level
(d) holes in the valence band move from lower energy level to higher energy level
Solution:
(a) electrons move from lower energy level to higher energy level in the conduction band
(c) holes in the valence band move from higher energy level to lower energy level