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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferHard2 min

PhysicsHardmultiple choice

Intensity per unit area versus wavelength is plotted for two black bodies of equal surface area, at temperatures $T_{1}$ and $T_{2} = 3 T_{1}$ . Body 1 radiates $E_{1}$ per second and body 2 radiates $E_{2}$ per second. Select the correct statement(s).

Options:(select one or more)

Answer:

A, B, C

Solution:

$E \propto A T^{4}$ with equal $A$ gives $E_{2} = 3^{4} E_{1} = 81 E_{1}$ (A). Wien gives $λ_{m} \propto \frac{1}{T}$ , so $λ_{2} = \frac{λ _{1}}{3}$ (B). The area under an intensity curve is $σ T^{4}$ , 81 times larger for body 2 (C). D is false.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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