Q .     In a Carnot's cycle, the working substance
absorbs heat `Q_1` at temperature `T_1` and rejects
heat `Q_2` at temperature `T_2` ·The change of
entropy during the Carnot's cycle is

UPSEE 2011
A

`Q_1/T_1`

B

`Q_2/T_2`

C

`(Q_1/T_1)+(Q_2/T_2)`

D

Zero

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