Question
Discuss Weidemann – Franz law.
Solution
Weidman-Franz law is based on the experimental observation that, a material, which is good conductor of electricity, is also a good conductor of heat.
The observation is on the basis of the fact that the free electrons take heat from hot to cold end.
On the basis of experimental observations, Weidemann and Franz put forward a law which states:
“ The ratio of the thermal conductivity to electrical conductivity of a metal is proportional to the temperature of metal and is same for all the metals at a given temperature”.
i.e.
The observation is on the basis of the fact that the free electrons take heat from hot to cold end.
On the basis of experimental observations, Weidemann and Franz put forward a law which states:
“ The ratio of the thermal conductivity to electrical conductivity of a metal is proportional to the temperature of metal and is same for all the metals at a given temperature”.
i.e.
