Which condition decreases efficiency in cryogenic Carnot engines?

💡 Explanation

Increased thermal boundary layer resistance impedes ideal heat transfer within the engine because it increases thermal resistance between the working fluid and the heat reservoirs, therefore lowering actual thermal efficiency, rather than achieving the Carnot limit.

• Which outcome occurs when acoustic phonons strongly modulate a crystal lattice's periodicity?
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• Which risk increases for a polymer when molecular chains untangle?
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• Which optical consequence results when stimulated emission ceases in a laser?
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