Consider a small hot rock at 390 K inside a building with cold air and cold walls at 273 K. Air is a very poor conductor of heat, so the bulk of the energy transfer is radiative.
(a) Are the molecules of the walls and air sending out electromagnetic waves?
(b) Since the cooler system is much larger, doesn’t it radiate much more energy altogether than the rock?
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(c) Considering your answer to part
(b), why is there a net flow of energy from the rock to the air, rather than vice versa?