ncert says that, on increasing temperature, the metallic conductance decreases. how , pls define?
Asked by kumari sweta | 17th Nov, 2013, 08:03: AM
Expert Answer:
The conductivity of metal varies with temperature. It decreases with increase in temperature of the metal. The increase of temperature in metal results in greater thermal agitation of the ions and this results in decrease of mean free path of the free electrons. Since mean free path depends on the mobility of the material, the mobility decreases. The conductivity of the metal is directly proportional to the mobility and thus the conductivity decreases.
The conductivity of metal varies with temperature. It decreases with increase in temperature of the metal. The increase of temperature in metal results in greater thermal agitation of the ions and this results in decrease of mean free path of the free electrons. Since mean free path depends on the mobility of the material, the mobility decreases. The conductivity of the metal is directly proportional to the mobility and thus the conductivity decreases.
Answered by Vaibhav Chavan | 18th Nov, 2013, 12:33: PM
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