Physics · May / June 2026 · Paper 12 · Question 18
5054Particle model
A helium balloon rises through the atmosphere. The temperature of the helium in the balloon remains constant, but the pressure of the helium decreases. Which row describes what happens to the helium atoms and to the density of the helium?
- Amove closer together, decreases
- Bmove closer together, increases
- Cmove further apart, decreases
- Dmove further apart, increases
As printed in the paper
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Correct answer: C. move further apart, decreases
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