Question

if temperature increases what happens to thermal conductivity

Answer 1

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Here is your answer

As we know, it is main cause of heat conduction. Thats why on increasing temperature, conductivity decreases.. For metals, the thermal conductivity is mainly a function of the motion of free electrons. As the temperature increases, the molecular vibrations increase (in turn decreasing the mean free path of molecules).

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Answer 2

The thermal conductivity decreases as in both conductors and semi conductors,when temperature is increased,molecules starts to vibrate more due to thermal energy.This increase in vibration decreases the mean free path of molecules and therby its electrons.Now in case of conductors there are many more free electrons than semi conductors so when lattice vibration takes place all these electrons have their mean free path reduced therby reducing conductivity.Whereas there are way less free electrons in a semiconductor than the conductor and increase in temperature will make the mean free path less but conductivity will altogether increase as valence electrons will move up to free electrons. So the increase in the number of valence electron to free electron is more in semi conductor than the conductor. So collision is less in semiconductor than conductors.

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