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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferEasy2 min

PhysicsEasysingle choice

The ratio of the thermal conductivities of two rods of the same area is 3 : 7. If their thermal resistances are equal, find the ratio of their lengths, first to second.

Options:

Answer:

Solution:

$R = \frac{l}{k A}$ is equal, so $\frac{l _{1}}{l _{2}} = \frac{k _{1}}{k _{2}} = \frac{3}{7} = 0.43$ . B.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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