: The maximum theoretical efficiency of a Carnot engine operating between reservoirs at the steam point and at room temperature is about A :

The value is    or  21.45%

Explanation:

From the question we are told that

    The first reservoir is at steam point    

    The  second reservoir is at room temperature

Generally the  maximum theoretical efficiency of a Carnot engine  is mathematically evaluated as

=>    

=>    

your answer is, orbit around the nucleus

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