An electric field us applied to a semiconductor.Let the number of charge carriers be n and the average drift speed be v.If the temperature is increased,

Options

A. both n and v will decrease
B. both n and v will increase
C. n will increase but v will decrease
D. v will increase but n will decrease

Answer

C

Explanation

When temperature of a semiconductor is increased, more covalent bonds get broken. As a result of it, the number of charge carriers will increase. Due to rise in temperature, the atoms/ions of the semiconductor, will start vibrating with more amplitude and frequency. Due to it, the electrons drifting towards the positive end of semiconductor will suffer more rapid collisions, consequently drift velocity will decrease.