Question
A copper sphere $5 \mathrm{~cm}$ in diameter whose emisslvty is $0.3$ is heated in a furnace to $400^{\circ} \mathrm{C}$. At what rate does it radiate?
Step 1
The diameter of the sphere is given as $5 \, \text{cm}$, so the radius will be half of the diameter. Therefore, $r = \frac{5}{2} = 2.5 \, \text{cm}$. Show more…
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