The thermal conductivity of a rod depends on

(a) length
(b) mass
(c) area of cross section
(d) material of the rod

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Solution

(d) material of the rod

The thermal conductivity of a rod depends only on the material of the rod. For example, metals are much better conductors than non-metals because metals have large number of free electron that can move freely anywhere in the body of the metal and carry thermal energy from one place to other. Also, 2 copper rods having different lengths and areas of cross-section have same thermal conductivity that depends only on the number of free electrons in copper.

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The thermal conductivity of a rod depends on (a) length (b) mass (c) area of cross section (d) material of the rod

The thermal conductivity of a rod depends on

(a) length
(b) mass
(c) area of cross section
(d) material of the rod