Which maximum theoretical efficiency limits a Carnot heat engine operating between 800K heat source and 300K heat sink?

💡 Explanation

When a Carnot engine operates, its maximum theoretical efficiency is determined by the temperature difference between the hot and cold reservoirs, calculated as (1 - T_cold / T_hot), leading to (1-300/800) = 62.5%. Therefore, 62.5% efficiency is the limit for a reversible cycle, rather than higher values that neglect the second law of thermodynamics or lower values resulting from irreversible processes.

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