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Even Carnot engine cannot give 100% efficiency, because we cannot ___________

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Even Carnot engine cannot give 100% efficiency, because we cannot ___________

(a) Prevent radiation

(b) Find ideal sources

(c) Reach absolute zero temperature

(d) Eliminate friction
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The correct choice is (a) Prevent radiation

To explain I would say: The efficiency of a Carnot engine will be 100% when its sink is at 0K. But the temperature 0K cannot be realised in practice, so the efficiency is never 100%.
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