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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumsingle choice

The thermal conductivities of two materials are in the ratio 1 : 2. What will be the ratio of the thermal resistances of rods of these materials having lengths in the ratio 1 : 2 and areas of cross-section in the ratio 1 : 2?

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Answer:

Solution:

$R = \frac{l}{k A}$ . $\frac{R _{1}}{R _{2}} = \frac{\frac{1}{( 1 \times 1 )}}{\frac{2}{( 2 \times 2 )}} = \frac{1}{\frac{1}{2}} = 2 : 1$ . A.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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