$($Problem $5)$ Consider a large furnace with opaque, diffuse, gray walls at $3000$ K having

an emissivity of $0\mathrm{.}85.$ A small, diffuse, spectrally selective object in the furnace is main$-$

tained at $300$ K $.$ For the specified points on the furnace wall $($A$)$ and the object $($B$),$ indicate

values for $\backslash$epsi lon,$\backslash$alpha $,$E$,$G$,$ and J$.$

Figure $3$: Relevant figure for problem $5$