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Photoelectric Effect

ICSE · Class 12 · Physics

Quick revision notes for Photoelectric Effect — ICSE Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.

70 questions30 flashcards5 concepts

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Key Topics to Revise

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.
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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.
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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.
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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.

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Full Notes

Key Concepts

The phenomenon of emission of electronsHertz observed in 1887 that ultravioletJThe photoelectric current is directly proportionalThe negative potential of P2 relative

Frequently Asked Questions

What are the important topics in Photoelectric Effect for ICSE Class 12 Physics?
Photoelectric Effect covers several key topics that are frequently asked in ICSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Photoelectric Effect — ICSE Class 12 Physics?
Understand the core concepts first, then work through the 70 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

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