Question

what happens to the thermal conductivity of a wall if it's thickness is doubled?
a) becomes double
b) remains same
c) becomes half
d)becomes one fourth ​

Answer 1

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Larger the cross sectional area A of solid, larger number of molecules and free electrons on each layer parallel to its cross sectional area and hence greater will be rate of flow of heat through solid. Thus, If Thickness of wall is doubled,The thermal conductivity becomes double.

Explanation:

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