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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumsingle choice

The temperature $θ$ of a body is slightly more than the temperature $θ_{0}$ of the surroundings. Its rate of cooling $R$ versus the temperature $θ$ of the body is plotted. Its shape would be (graphs (A) to (D) shown in the figure):

Options:

Answer:

Solution:

By Newton's law, $R \propto (θ - θ_{0})$ for a small excess. $R$ is a straight line that rises with $θ$ and cuts the $θ$ axis at $θ_{0}$ . That is graph (B). B.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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