IB Physics HL B.4.1 First law of thermodynamics Question Bank
Practise IB Physics HL B.4.1 by applying first law of thermodynamics 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.4.1 (HL)—First law of thermodynamics 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.
Work is done by the gas because there is an increase in volume / gas expands.
So W is positive.
Delta U is greater than zero because P is constant and V increases.
From the first law, Q = Delta U + W, so Q is positive, which means energy is transferred into the gas.
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