A carnot engine has the same efficiency ...

A carnot engine has the same efficiency (i) between 100 K and 500 K and (ii) between T K and 900 K. Calculate the temperature of the sink.

`200 K`

`180 K`

`200 K`

`230 K`

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The correct Answer is:

Efficiency is `eta = 1 - T_2/ T_1`. That is, `eta = 1 - 100/ 500 = 1 - T/900 rArr 100 /500 rArr T = 180K`

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