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Dual Nature of Radiation and Matter — Syllabus

CBSE · Class 12 · Physics

What Dual Nature of Radiation and Matter covers in CBSE Class 12 Physics: 4 topics, for the 2026-27 session. Part of the CBSE Class 12 Physics syllabus.

109 questions60 flashcards6 formulas & key relations5 concepts

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An infographic comparing the three main types of electron emission: Thermionic emission, Field emission, and Photoelectric emission, highlighting the energy source for each.
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4 Topics · CBSE Class 12 Physics · 2026-27

Topics in Dual Nature of Radiation and Matter

1

1. Electron emission and work function

  • Metals contain free electrons, but these electrons cannot normally escape from the metal surface.
  • An electron needs minimum energy to come out of a metal surface.
  • This minimum energy is called the work function of the metal.
2

2. Photoelectric effect and experimental observations

  • Photoelectric effect is the emission of electrons from a metal surface when light of suitable frequency falls on it.
  • Heinrich Hertz discovered photoelectric emission in 1887.
  • Hallwachs and Lenard studied photoelectric emission during 1886-1902.
3

3. Failure of wave theory and Einstein’s explanation

  • Classical wave theory explains interference, diffraction, and polarisation, but not photoelectric effect.
  • Wave theory predicts that K_max should increase with intensity, but observations show that it depends on frequency.
  • Wave theory predicts no threshold frequency, but experiments show a clear threshold frequency.
4

4. Photon nature of light

  • Light behaves like a wave in interference, diffraction, and polarisation.
  • Light behaves like particles called photons in photoelectric effect and Compton effect.
  • Each photon has energy hν and momentum hν/c.

Key Concepts

Central concept: Dual nature of radiation and matter

Cathode rays and electron discoveryElectron emission from metalsPhotoelectric effectPhotoelectric current and factors affecting itWave theory limitationsEinstein’s photon hypothesisPhoton nature of lightWave nature of matter

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Frequently Asked Questions

What are the important topics in Dual Nature of Radiation and Matter for CBSE Class 12 Physics?
Key topics in Dual Nature of Radiation and Matter include Electron emission and work function, Photoelectric effect and experimental observations, Failure of wave theory and Einstein’s explanation, Photon nature of light. Study these first, then practise questions on each for the CBSE Class 12 board exam.
How should I revise Dual Nature of Radiation and Matter for the CBSE Class 12 board exam?
Learn the core ideas first, then work through the 109 practice questions on Dual Nature of Radiation and Matter. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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