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Two Carnot engines A and B are operated ...

Two Carnot engines A and B are operated in series. The engine A receives heat from the source at temperature `T_1` and rejects the heat to the sink at temperature T. The second engine B receives the heat at temperature T and rejects to its sink at temperature `T_(2)`. For what value of T the efficiencies of the two engines are equal?

A

`(T_(1)+T_(2))/(2)`

B

`(T_(1)-T_(2))/(2)`

C

`T_(1)T_(2)`

D

`sqrt(T_(1)T_(2))`

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