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Physics · Oct / Nov 2016 · Paper 12 · Question 18

5054Particle model

A gas expands slowly and its temperature remains constant. What happens to the gas molecules?

  1. AThey move further apart and their average speed decreases.
  2. BThey move further apart and their average speed increases.
  3. CThey move further apart and their average speed remains unchanged.
  4. DThey stay the same distance apart and their average speed decreases.

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Correct answer: C. They move further apart and their average speed remains unchanged.

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