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JAMB Physics 1981 Question 6

Question 6

Gas Laws

When a fixed mass of an ideal gas expands at constant temperature, which property of the gas molecules increases?

  1. A.Average number per unit volume
  2. B.Average kinetic energy
  3. C.Average speed
  4. D.Average separation
  5. E.Average number of collisions per unit time.
Show the answer and explanation

Answer: D (Average separation)

Explanation

At constant temperature the molecules keep the same average kinetic energy and speed, but in a larger volume they are further apart, so their average separation increases (and collisions become less frequent).