Q88 / 180 · NEET 2019 (All India) · Physics

The unit of thermal conductivity is

A
$J m K^{- 1}$
B
$J m^{- 1} K^{- 1}$
C
$W m K^{- 1}$
Correct answer
D
$W m^{- 1} K^{- 1}$

Solution

\frac{∆ Q}{∆ t} = K A \frac{∆ T}{∆ l}

K = \frac{∆ Q}{∆ t} \frac{∆ l}{∆ T} \frac{1}{A}

∴

Unit of

K

is

W m^{- 1} K^{- 1}

Hence, the correct answer is option: 'D'.

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