MDCAT Physics MCQ #3402

For a reversible isothermal expansion of an ideal gas, the change in entropy is given by

MDCAT Physics MCQ #3402

  1. Question 1

    Q1. For a reversible isothermal expansion of an ideal gas, the change in entropy is given by

    • A) nR ln(V_f / V_i)
    • B) nR ln(V_i / V_f)
    • C) nR ln(P_f / P_i)
    • D) nR ln(P_i / P_f)

    Answer: nR ln(V_f / V_i)

    Explanation: ΔS = Q / T = nRT ln(V_f / V_i) / T = nR ln(V_f / V_i). Other options misapply the formula for entropy change.