Question

Give an example for the material which is insulator at low temperature and becomes conductor at moderate/high temperature?​

Answer 1

Answer:

-459.67

∘

F

Semi-conductors behaves as an ideal insulator at absolute zero temperature(0K) which is 0 Kelvin. Because at the absolute zero temperature the electrons in the valence band of semi-conductors do not posses enough thermal energy to overcome forbidden energy gap. so semi-conductors stop conducting and behaves as an insulator.

But 0K=−459.67F

Hence correct answer is −459.67F.

Answer 2

Answer:

${\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Question}}}}}}}}}}}}}$

Give an example for the material which is insulator at low temperature and becomes conductor at moderate/high temperature?

${\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}$

At Absolute zero temperature (0 Kelvin) the electrons in the valence band of semiconductors do not possess enough thermal energy to overcome forbidden energy gap. So semiconductors stop conducting and behave as insulators.

When temperature is raised above O k , electrons gain thermal energy and start jumping into conduction band and participate in conduction.

In conductors, the resistance increases with the increase in temperature ( Due to increase in lattice vibration), while in semiconductors resistance decreases with rise in temperature. (Thats why they are called negative temperature coefficient of resistance)

$\huge\sf\fbox\red{Ans By Mona}$