A spherical opaque object emits at temperature Tc and is surrounded by an op6cally thin spherical shell. This shell absorbs/emits thermally only in a narrow spectral line with an absorp6on coefficient shown below (assume the change in Planck fcnt is negligible from ν0 to ν1). Sketch the spectrum for this spectral line for ray A and ray B assuming Ts < Tc. How do your sketches change if Ts > Tc? Ts αν Tc ν 0
ν0 ν1 A
B