Question $12(4$ points$)$

What is the maximum thermal efficiency of a heat engine operating between two thermal reservoirs with temperatures $\backslash (250^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )$ and $\backslash (40^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )?0\mathrm{.}330\mathrm{.}360\mathrm{.}402\mathrm{.}490\mathrm{.}291\mathrm{.}4921$ of $25$ questions saved