StudyLoop
Short answer·Standard multi-step (3/5)·Calculator allowed

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 a gas, take molecular diameter d=3.0×10−10 md=3.0\times10^{-10}\text{ m} and number density n=2.5×1025 m−3n=2.5\times10^{25}\text{ m}^{-3}. Use λ=12πd2n\lambda=\frac{1}{\sqrt2\pi d^2n} and take 2π≈4.44\sqrt2\pi\approx4.44.
Total: 2 marks

(a) Find the approximate mean free path. (1 mark)

(b) State how the answer changes if the molecular diameter is doubled while number density is unchanged. (1 mark)

Something wrong with this item?

Flag this question

What should we review?

cbse-physics-11.u9.t9-5.saq.003

Issue type

The current page address, technical context, selected issue type, and any details or email you enter are sent with this report. Your StudyLoop profile and answers are not sent.

Please provide feedback

Tell us what would make StudyLoop better.

Feedback type

The current page address, technical context, selected issue type, and any details or email you enter are sent with this report. Your StudyLoop profile and answers are not sent.