How does potential barrier of a semiconductor vary with temperature?

How does the resistance of a semiconductor vary with temperature ?

How does resistivity of semiconductor vary with temperature? Give reason for each case?

The potential barrier of a semiconductor is 0.6 Vat room temperature. What is the approximate value of its potential barrier, if the temperature is increased by 20^@C ?

How does the conductivity of a semiconductor change with temperature? Why?

What are semiconductors? How electrical conductivity of semiconductors vary with temperature? Give one example of intrinsic semiconductor.

How does electrical conductivity of semiconductors vary with temperature?

How does the conductivity of a metallic conductor vary with temperature?

How does the resistivity of a conductor vary with temperature?