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NEET-XII-Physics
P1 year:2019
- #20The unit of thermal conductivity is :
(1) ``J m K^{-1}``
(2) ``J m^{-1} K^{-1}``
(3) ``W m K^{-1}``
(4) ``W m^{-1} K^{-1}``digAnsr: 4Ans : ( 4 )
Sol. The heat current related to difference of
temperature across the length l of a
conductor of area A is
= â–µ
dH KA
T
dt
(K = coefficient of thermal
conductivity)
∴
dH
K
A dt T
=
â–µ
Unit of K = Wm-1 K-1
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