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Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure.

1. AB → Isothermal expansion
2. AC → Adiabatic expansion
3. Tₐ > Tᵦ
4. Tₐ = Tᵦ

Correct answer: Tₐ = Tᵦ

Solution

In isothermal expansion, the temperature remains constant, so Tₐ = Tᵦ. Adiabatic expansion involves temperature change, but the question specifies isothermal conditions for AB.

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