Physics · May / June 2023 · Paper 41 · Question 3
0625
As printed in the paper
The question as text
A rubber balloon is inflated with helium and sealed so that no helium escapes. The balloon is positioned immediately below the ceiling in a room. Heaters are switched on and the temperature of the air in the room increases.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
3(a)[2]
heated / hot(ter) / warm(er) air is less dense OR cool(er) air is more dense
heated / hot(ter) / warm(er) air rises (to ceiling displacing cooler air) OR cool(er) air falls (displaced by warm(er) air)
3(b)(i)[1]
speed / velocity (of particles) increases OR (they) move faster
3(b)(ii)[3]
(higher temperature means) particles collide (with rubber) harder / with more force / with greater momentum (change) (larger volume means) particles collide (with rubber) less frequently
OR
(larger volume means) larger (surface) area (for particle collisions)
effect of larger volume cancels effect of increased temperature / owtte
OR
the effect of larger area cancels the effect of larger force / owtte
OR
P = F / A so the two changes cancel each other / owtte
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