Ideal gases and kinetic theory

Ideal gases and kinetic theory Quiz

Spec 149–152 · Edexcel A-Level Physics: Quiz

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5 questions, one answer each

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1. Which quantity in $pV = \frac{1}{3}Nm\langle c^2\rangle$ comes from the random motion of the molecules?
- A. N
- B. m
- C. ⟨c²⟩
- D. V
2. The temperature of an ideal gas rises from 300 K to 600 K. By what factor does the mean kinetic energy of a molecule change?
- A. ×2
- B. ×4
- C. ×√2
- D. No change
3. What is the pressure of 2.0 × 10²² molecules in a 1.0 × 10⁻³ m³ container at 300 K?
- A. 8.3 × 10⁴ Pa
- B. 2.8 × 10³ Pa
- C. 6.2 × 10⁵ Pa
- D. 8.3 × 10⁷ Pa
4. In the Boyle's law experiment, why is the pressure increased slowly?
- A. To reduce the uncertainty in the length reading
- B. So the gas stays at a constant temperature
- C. To increase the mass of the air trapped
- D. To keep the cross-sectional area constant
5. Two ideal gases, X and Y, are at the same temperature. Molecules of X have a greater mass than molecules of Y. Which statement is correct?
- A. Molecules of X have the greater mean kinetic energy
- B. Molecules of Y have the greater rms speed
- C. Molecules of X have the greater rms speed
- D. Both have the same rms speed