Question

In semiconductors and insulators, on increasing the temperature, resistivity decreases because
O Time between collisions (T ) increases
O Free electrons density (n) increases more to compensates any decrease in relaxation time (T)
O Free electron density (n) decreases
O Multiplication of free electron density (n) and relaxation time ('t), decreases​

Answer 1

Explanation:

Among the various options given in question statement the correct option is

option B

When the temperature in increased the forbidden gap between the two bands reduces and the electrons move towards conduction band. SO upon increasing the temperature, the density of conductive electron increases and hence resistivity decreases