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The efficiency of a Carnot engine operating with reservoir temperature of 100°C and -23°C will be

Asked in NEET 1997 · Entropy and the Carnot Engine

• (1) (373+250)/(373)
• (2) (373-250)/(373)
• (3) (100+23)/(100)
• (4) (100-23)/(100)

Step-by-step solution

Why the other options are wrong

• (1) Adds the two temperatures where the efficiency needs their difference; it would give a value greater than 1.
• (3) Uses the Celsius readings and adds them; the Carnot formula only works on the absolute scale.
• (4) Uses the Celsius readings; converting, 100°C=373 K and -23°C=250 K.

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