Exam-style question
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What is the Second Law of Thermodynamics in relation to heat engines?.
- A.Energy cannot be created or destroyed.
- B.Heat cannot spontaneously flow from a colder body to a hotter body.
- C.The efficiency of a heat engine can be 100%.
- D.All energy transfers are perfectly efficient.
Model answer
What a good answer should say
- Heat cannot spontaneously flow from a colder body to a hotter body.
Explanation
Why this works
This option correctly states the essence of the Second Law of Thermodynamics, which implies that heat engines cannot convert all heat energy into work without some energy being lost as waste heat.
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