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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumsingle choice

Silver, iron and wood have conductivities $K_{s} > K_{i} > K_{w}$ . The same heat flows per second per unit area through each. The temperature gradients $X_{s}$ , $X_{i}$ and $X_{w}$ then satisfy:

Options:

Answer:

Solution:

$\frac{Q}{A t} = K X$ is fixed, so $X \propto \frac{1}{K}$ . The best conductor has the smallest gradient, so $X_{s} < X_{i} < X_{w}$ . D.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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