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IB Physics HL B.4.4 Entropy and disorder Question Bank

Practise IB Physics HL B.4.4 by applying entropy and disorder concepts to exam-style physics questions.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • identify the relevant physical quantity, model or diagram
  • apply the correct equation and units to the evidence
  • justify the result using conservation laws, forces or energy relationships

B.4.4 (HL)—Entropy and disorder question 1

[Maximum number: 2]

The p V diagram shows a heat engine cycle consisting of adiabatic, isothermal and isovolumetric parts. The working substance of the engine is an ideal gas.

Figure for Question B.4.4 (HL)—Entropy and disorder question 1 — IB Physics HL

The following data are available:

pA=5.00×105 PaVA=2.00×10−3 m3TA=602 KpB=3.00×104 PapC=4.60×103 Pa\begin{aligned} & p_{\mathrm{A}}=5.00 \times 10^{5} \mathrm{~Pa} \\ & V_{\mathrm{A}}=2.00 \times 10^{-3} \mathrm{~m}^{3} \\ & T_{\mathrm{A}}=602 \mathrm{~K} \\ & p_{\mathrm{B}}=3.00 \times 10^{4} \mathrm{~Pa} \\ & p_{\mathrm{C}}=4.60 \times 10^{3} \mathrm{~Pa} \end{aligned}

Suggest, for the change A⇒BA \Rightarrow B, whether the entropy of the gas is increasing, decreasing or constant.

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