O-LevelPhysicsThermal Physics5054/12 · May/June 2019 · Q231 Mark
In low-pressure hydrogen, there are no forces between the molecules except during collisions with each other. Which statement describes the motion of a molecule between one collision and the next?
AIt moves with changing speed and continuously changes direction.
BIt moves with changing speed in a straight line.
CIt moves with constant speed and continuously changes direction.
DIt moves with constant speed in a straight line.
✓ Correct answer
D: It moves with constant speed in a straight line.
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