In the first stage of a two-stage Carnot engine

In the first stage of a two-stage Carnot engine

In the first stage of a two-stage Carnot engine, energy is absorbed as heat Q₁at temperature T₁, work W₁ is done, and energy is expelled as heat Q₂ at a lower temperature T₂.The second stage absorbs that energy as heat Q₂ does work W₂, and expels energy as heat Q₃ at a still lower temperature T₃. Prove that the efficiency of the engine is (T₁ – T₃)/T_1.

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