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Thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsThermodynamics2 Marks
Question
Can you design a heat Engine of 100% efficiency? Explain your answer.
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Answer

The efficiency of a heat engine is $\eta=1-\frac{\text{T}_2}{\text{T}_1}$ The efficiency of heat engine will be 100% or 1 if, $T_2$ = 0K Since temperature equal to 0K cannot be reached, so a heat engine cannot have 100 % efficiency.

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