Question:
The coefficient of thermal conductivity of a metal rod depends on its
The coefficient of thermal conductivity of a metal rod depends on its
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Thermal conductivity is a property of the material only.
Updated On: Oct 1, 2026
- area of cross section
- mass
- material of the rod
- length used
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
The coefficient of thermal conductivity \(K\) is defined by \(Q = \frac{KA\Delta T\,t}{l}\). It is the heat flow per unit area per unit temperature gradient.
Step 2: Reason:
The area \(A\) and length \(l\) already appear separately in the formula, so \(K\) does not depend on them. Mass also does not enter. \(K\) depends only on the material of the rod, for example copper has a high \(K\) and wood a low one.
Final Answer:
Thermal conductivity depends on the material of the rod, option (C). \[ \boxed{\text{Material of the rod}} \]
The coefficient of thermal conductivity \(K\) is defined by \(Q = \frac{KA\Delta T\,t}{l}\). It is the heat flow per unit area per unit temperature gradient.
Step 2: Reason:
The area \(A\) and length \(l\) already appear separately in the formula, so \(K\) does not depend on them. Mass also does not enter. \(K\) depends only on the material of the rod, for example copper has a high \(K\) and wood a low one.
Final Answer:
Thermal conductivity depends on the material of the rod, option (C). \[ \boxed{\text{Material of the rod}} \]
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