Assertion A: Efficiency of a reversible heat engine will be highest at -273⁰c temperature of cold reservoir
Reason R: Efficiency of Cornot's engine depends not only on temperature of cold junction but it depends on the temperature of hot reservoir too and is given as $η = 1 - \frac{T_{2}}{T_{1}}$

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Both A and R true but R is not correct explanation of A

A false R is true

Both A and R true but R is correct explanation of A

A true, R false

answer is D.

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Detailed Solution

Efficiency of Cornot's engine depends not only on temperature of cold junction but it depends on the temperature of hot reservoir too and is given as $η = 1 - \frac{T_{2}}{T_{1}}$

Here, $T_{2}$ is 0 at -273⁰ C making the value of efficiency 1.

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