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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason: R
Assertion A: Efficiency of a reversible heat engine will be highest at -273° C temperature of cold reservoir.
Reason R: The efficiency of Carnot’s engine depends not only on temperature of cold reservoir but it depends on the temperature of hot reservoir too and is given as $η = (1 - \frac{T_{2}}{T_{1}})$
In the light of the above statements, choose the correct answer from the options given below

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Both A and R are true and R is the correct explanation of A

A is false but R is true

A is true but R is false

Both A and R are true but R is NOT the correct explanation of A

answer is C.

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Detailed Solution

If cold reservoir temperature is -273^oC = 0 K,
$η = (1 - \frac{0}{T_{1}}) = 1$ which is highest efficiently
so option 3 is correct.

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