Cambridge International AS & A Level Physics · A2 · data analysis
Ideal-gas cycle and first law
A Level extension · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 15
- Topics
- 1
- Answer
- Complete
Question15 marks
One mole of monatomic ideal gas follows clockwise vertices (volume in 10⁻³ m³, pressure in kPa) (1, 100), (1, 300), (3, 300), (3, 100), (1, 100). (a) Find work on every leg and net work. (b) Find temperatures A, B and C using R = 8.31 J/(mol K). (c) Find ΔU and Q on A→B and B→C. (d) Verify net heat equals net work. (e) Explain orientation and heat rejection.
Task interpretation
What a complete response should do
Identify the useful evidence, process it with units, and make only the conclusion the data supports.
Split the problem into linked stages and state why each relationship applies.
- Response type
- data analysis
- Allocation
- 15 marks
- Demand
- demanding
Rectangular gas cycle
Constant-volume and constant-pressure processes.
Read the exact data as a table
| Volume / 10⁻³ m³ | Pressure / kPa |
|---|---|
| 1 | 100 |
| 1 | 300 |
| 3 | 300 |
| 3 | 100 |
| 1 | 100 |
These are the supplied readings, not a worked answer. Lines join the supplied readings; they are not a fitted model.
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Use your answer and the marking steps—not confidence alone—to choose.