Answer: 4.
- A 2
- B 4
- C √2
- D 8
Correct answer: B. 4
Explanation: rms speed is proportional to √T, so doubling the speed requires the absolute temperature to become 4 times its original value.
Not all gas molecules move at the same speed - the Maxwell-Boltzmann distribution shows the spread, with the most probable speed vp slightly less than the average vavg, which is slightly less than the root-mean-square speed vrms used in the pressure formula.
Concept context
Kinetic theory of gases connects molecular motion to pressure and temperature, explaining gas laws, specific heats, and molecular speeds.