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Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

For nitrogen gas at 300 K300\text{ K}, take M=28×10−3 kg mol−1M=28\times10^{-3}\text{ kg mol}^{-1} and R=8.3 J mol−1 K−1R=8.3\text{ J mol}^{-1}\text{ K}^{-1}.
Total: 4 marks

(a) Find the average translational kinetic energy of one mole of molecules. (1 mark)

(b) Find the rms speed. (2 marks)

(c) Explain why this rms speed is not the speed of every molecule. (1 mark)

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cbse-physics-11.u9.t9-3.laq.004

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