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A heat engine takes up heat at 1000 K and liberates heat at 200 K. Which of the following is an impossible amount of heat rejected by the engine if 100 J of heat is absorbed:

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60 J

80 J

90 J

15 J

answer is D.

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Detailed Solution

$η = 1 - \frac{200}{1000} = \frac{| w |}{100} \Rightarrow | w | = 80 J$

$∴$ Heated rejected $= 100 - 80 = 20 J$ .

Heat rejected can be more than 20 J. not less.

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