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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumsingle choice

Radiation from a black body at the thermodynamic temperature $T_{1}$ is measured by a small detector at a distance $d_{1}$ from it. When the temperature is increased to $T_{2}$ and the distance to $d_{2}$ , the power received by the detector is unchanged. What is the ratio $\frac{d _{2}}{d _{1}}$ ?

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Answer:

Solution:

The power received $\propto \frac{T ^{4}}{d ^{2}}$ . Equating, $\frac{d _{2}^{2}}{d _{1}^{2}} = \frac{T _{2}^{4}}{T _{1}^{4}}$ , so $\frac{d _{2}}{d _{1}} = (\frac{T _{2}}{T _{1}})^{2}$ . B.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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