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Photoelectric Effect — Syllabus

ICSE · Class 12 · Physics

What Photoelectric Effect covers in ICSE Class 12 Physics: 4 topics, for the 2026-27 session. Part of the ICSE Class 12 Physics syllabus.

70 questions30 flashcards6 formulas & key relations5 concepts

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4 Topics · ICSE Class 12 Physics · 2026-27

Topics in Photoelectric Effect

1

1. Discovery, Observation, and Basic Terms

  • W. Smith, along with other scientists, discovered in 1873 that light of suitable energy falling on metals causes electric current to flow.
  • Hertz observed in 1887 that ultraviolet rays falling on the negative plate of an electric discharge tube make the discharge easier.
  • Hallwachs confirmed the effect experimentally in 1888 using two zinc plates in a vacuum bulb connected to a battery and galvanometer.
2

2. Hertz-Lenard Observations and Experimental Laws

  • Hertz and Lenard studied photoelectric effect by using plates of different metals and light of different frequencies and intensities.
  • A simple arrangement uses two metallic plates P1 and P2 in an evacuated tube, with P1 placed in front of a quartz window.
  • P1 acts as the cathode plate, and P2 acts as the collector or anode.
3

3. Laws of Photoelectric Emission and Failure of Wave Theory

  • The rate of emission of photoelectrons varies directly as the intensity of incident light.
  • The maximum kinetic energy of emitted photoelectrons is independent of intensity.
  • The maximum kinetic energy increases linearly with frequency.
4

4. Planck's Photon Hypothesis and Einstein's Explanation

  • In 1900, Planck proposed that radiation is emitted in discrete packets called quanta.
  • These quanta were later called photons.
  • Energy of each photon is hv.

Key Concepts

Central concept: Photoelectric effect: emission of electrons from metals due to incident light

Early observationsPhotoelectric termsHertz-Lenard experimentDependence on intensityDependence on frequencyLaws of photoelectric emissionFailure of wave theoryPlanck's quantum hypothesis

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Frequently Asked Questions

What are the important topics in Photoelectric Effect for ICSE Class 12 Physics?
Key topics in Photoelectric Effect include Discovery, Observation, and Basic Terms, Hertz-Lenard Observations and Experimental Laws, Laws of Photoelectric Emission and Failure of Wave Theory, Planck's Photon Hypothesis and Einstein's Explanation. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Photoelectric Effect for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 70 practice questions on Photoelectric Effect. 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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