carnot cycle

Question

A Carnot engine operates between 400 K and 300 K. Its efficiency is:

RankGuru · Accepted Answer

The **Efficiency ($\eta$)** of a perfectly reversible Carnot engine depends only on the temperatures of the hot source ($T_s$) and cold sink ($T_k$):
$\eta = 1 - \frac{T_k}{T_s}$
- Given $T_s = 400 	ext{ K}$ and $T_k = 300 	ext{ K}$.
$\eta = 1 - \frac{300}{400} = 1 - 0.75 = 0.25$
- As a percentage: $0.25 	imes 100\% = 25\%$.
- This represents the maximum possible efficiency that any heat engine can achieve between these two thermal reservoirs.

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carnot cycle

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