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Case study·Standard multi-step (3/5)·No calculator

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

A student uses the spectrum chart shown while comparing three radiations: P has wavelength 10−1 m10^{-1}\text{ m}, Q has wavelength 10−6 m10^{-6}\text{ m}, and R has wavelength 10−10 m10^{-10}\text{ m}.
Total: 3 marks

(a) Which has the highest frequency? (1 mark)

(b) Which is closest to infrared/visible boundary scale? (1 mark)

(c) Which is most likely an X-ray-scale radiation? (1 mark)

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cbse-physics-12.u5.t5-4.case.005

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