Question
Two spheres of the same material have radii $r$ and $4 r$ and temperatures $2 T_{0}$ and $T_{0}$ respectively. The ratio of rate of radiation of energy by the spheres is:(a) $1: 1$(b) $1: 2$(c) $2: 1$(d) $3: 1$
Step 1
The formula for power is $P = \sigma e A T^{4}$, where $\sigma$ is the Stefan-Boltzmann constant, $e$ is the emissivity of the material, $A$ is the surface area of the sphere, and $T$ is the temperature of the sphere. Show more…
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Thermodynamics
Round 2
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