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The efficiency of a Carnot engine using an ideal gas as the working substance is

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The efficiency of a Carnot engine using an ideal gas as the working substance is

(a) \(\cfrac{T_1-T_2}{T_1}\)

(b) \(\cfrac{T_1}{T_1-T_2}\)

(c) \(\cfrac{T_1T_2}{T_1-T_2}\)

(d) \(\cfrac{T_1-T_2}{T_1T_2}\)

(e) \(\cfrac {T_2(T_1-T_2)}{T_1(T_1+T_2)}\)

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 (e) \(\cfrac {T_2(T_1-T_2)}{T_1(T_1+T_2)}\)

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