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NEET PHYSICSMedium

The unit of thermal conductivity is :

1

J m K−1^{-1}

2

J m−1^{-1} K−1^{-1}

3

W m K−1^{-1}

4

W m−1^{-1} K−1^{-1}

Step-by-Step Solution

The heat current related to difference of temperature across the length ll of a conductor of area AA is dHdt=KAlΔT\frac{dH}{dt} = \frac{KA}{l} \Delta T. Therefore, K=lAdHdt1ΔTK = \frac{l}{A} \frac{dH}{dt} \frac{1}{\Delta T}. The unit of KK is W m−1K−1\text{W m}^{-1} \text{K}^{-1}.

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