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Question

Which of the following options are true regarding thermal conductivity?


A

The reciprocal of thermal conductivity is thermal resistivity.

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B

The greater the thermal conductivity, the greater the heat flow.

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C

The greater the thermal conductivity, the less the heat flow.

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D

The SI unit of thermal conductivity is JM1S1K1.

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Solution

The correct options are
A

The reciprocal of thermal conductivity is thermal resistivity.


B

The greater the thermal conductivity, the greater the heat flow.


D

The SI unit of thermal conductivity is JM1S1K1.


Thermal conductivity is the property of a material to conduct heat.

Formula for Thermal conductivity is

Q=KA(θ1θ2x)tK=QxA(θ1θ2)t
Where, K= Coefficient of thermal conductivity
Q= Amount of heat flowing normally through the faces.
(θ1θ2)= Temperature difference
t= time of flow
A= Area of the face

Thermal resistivity is the ability of a material to resist the flow of heat. Thermal resistivity is the reciprocal of thermal conductivity.

Thermal resistivity=1Thermal conductivity

The greater the thermal conductivity, the greater the heat flow.


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