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IB Physics HL B 4 1 Hl First Law of Thermodynamics Questions

Apply the first law of thermodynamics to HL questions on heat, work and internal energy, using sign conventions and PV diagrams to analyse gases and cycles.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • Apply Q=ΔU+W with a stated work sign convention to calculate heat transfer, internal-energy change and work in thermodynamic processes and cycles.
  • Use W=PΔV or PV-diagram areas together with process conditions to determine work, heat and internal-energy changes for isobaric, isochoric, isothermal and adiabatic changes.
  • Explain energy and temperature directions, compare alternative PV paths, and determine net heat or work over a complete cycle using ΔU=0 for the cycle.

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Study B.4.1 (HL)—First law of thermodynamics conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL B 4 1 Hl First Law of Thermodynamics Questions question 1

[Maximum number: 4]

This question is in two parts

With reference to the first law of thermodynamics, explain for the change of state A to B, why energy is transferred from the surroundings to the gas.

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