Discussion
Which comparison does the atmospheric heat engine make?
Answer: D
About 240 watts per square metre are absorbed and about 2 watts per square metre appear as kinetic energy, giving an efficiency near 1 per cent against a Carnot bound of 17. The remainder is transferred irreversibly by radiation and turbulent mixing. The final option describes a balance that holds in the steady state rather than an efficiency. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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