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JEE Main202330 Jan 2023Evening ShiftPhysicsThermodynamicsActual

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 - T 2 T 1

Options

  1. AA is true but R is false
  2. BBoth A and R are true but R is NOT the correct explanation of A
  3. CA is false but R is true
  4. DBoth A and R are true and R is the correct explanation of A

Correct answer

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

Step-by-step solution

As we know, η = 1 - T sin k T s o u r c e maximum value of   η = 1 ⇒ 1 = 1 - T sin k T s o u r c e ⇒ T sin k = 0   K = 273   ° C Therefore, both A and R are true and R is the correct explanation of A.

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