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PART - 2 CH - 11 Thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsPART - 2 CH - 11 Thermodynamics1 Mark
Question
When can the efficiency of a frictionless heat engine be 100%?
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Answer

When the temperature of the sink is absolute zero or the temperature of the source is infinite. Both of these are impossible.

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