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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediummultiple choice

Two spherical black bodies $A$ and $B$ have radii $r_{B} = 3 r_{A}$ . Their spectra peak at 300 nm and 900 nm respectively. Their temperatures are $T_{A}$ , $T_{B}$ and the total powers they emit are $E_{A}$ , $E_{B}$ . Then:

Options:(select one or more)

Answer:

A, D

Solution:

Wien: $\frac{T _{A}}{T _{B}} = \frac{900}{300} = 3$ (A). Power: $\frac{E _{A}}{E _{B}} = 3^{4} \times (\frac{1}{3})^{2} = \frac{81}{9} = 9$ (D).

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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