Electric field is applied to a semiconductor. In it density of conducting charge is n the drift velocity is v. Now increasing the temperature of semiconductor ……..

Options

A. v and n increases
B. v and n decreases
C. v increases and n remaining constant
D. v decreases and n increases

Answer

D

Explanation

v decreases and n increases
Increasing the temperature more covalent bonds are broken and number of free electrons and holes are increases so n increases. Now increasing the temperature so n increases. Now increasing the temperature oscillation of charge conductors also increases so drift velocity decreases.