A heat engine takes in (6.45 times 10^{3} mathrm{~J}) of thermal energy from a reservoir at (500

Question:

A heat engine takes in $6.45 \times 10^{3} \mathrm{~J}$ of thermal energy from a reservoir at $500 \mathrm{~K}$ and returns some of this energy to a reservoir at $T_{1}<500 \mathrm{~K}$. If this engine operates at an efficiency of 0. 450 , what is the maximum value possible for $T_{1}$ ?

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