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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumnumerical

A detector measures radiation from a black body at $T_{1}$ at a distance $d_{1}$ . The temperature is raised to $T_{2} = 1.5 T_{1}$ and the distance changed to $d_{2}$ , with the power received unchanged. Find $\frac{d _{2}}{d _{1}}$ (two decimals).

Answer:

2.25

Solution:

Power $\propto \frac{T ^{4}}{d ^{2}}$ , so $\frac{d _{2}}{d _{1}} = (\frac{T _{2}}{T _{1}})^{2} = 1.5^{2} = 2.25$ .

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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