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Question

Which of the following is true for an ideal gas undergoing an irreversible adiabatic expansion against constant external pressure?

Options

Choose one · Correct answer highlighted

Explanation

For an irreversible adiabatic expansion (q = 0), Δ U = w = -Pext Δ V. Since Δ V > 0, w < 0, and thus Δ U < 0.