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Two Carnot engines A and B are operated ...

Two Carnot engines A and B are operated in succession. The first one , A receives heat from a source at `T_1 = 800 K` and rejects to sink at `T_2K`. The second engine B receives heat rejected by the first engine and rejects to another sink at `T_3 = 300K`. If the work outputs of two engines are equal , them the value of `T_2` is

A

`100 K`

B

`300 K`

C

`550 K`

D

`700 K`

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