Photoelectric Effect — Chapter Summary
ICSE · Class 12 · Physics
Summary of Photoelectric Effect for ICSE Class 12 Physics. Key concepts: The phenomenon of emission, Hertz observed in 1887 that and J.
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Overview
Photoelectric effect is the emission of electrons from metals due to incident light. It shows that light transfers energy in discrete packets called photons, not in a continuous way. The effect depends strongly on frequency and only on the intensity for the number of emitted electrons. This chapter
Key Concepts
The phenomenon of emission of electrons
The phenomenon of emission of electrons from metals under the effect of light is called photoelectric effect. The emitted electrons are photoelectrons
Hertz observed in 1887 that ultraviolet
Hertz observed in 1887 that ultraviolet rays falling on the negative plate of an electric discharge tube make the discharge easier. Hallwachs confirme
J
J.J. Thomson established in 1898 that light falling on a metal surface causes electron emission. Lenard explained in 1900 that electrons from the nega
The photoelectric current is directly proportional
The photoelectric current is directly proportional to the intensity of incident light. Greater intensity means more photons per second and therefore m
The negative potential of P2 relative
The negative potential of P2 relative to P1 at which the photoelectric current becomes zero is called stopping potential or cut-off potential. It give
Learning Objectives
- Understand the meaning of photoelectric effect, photoelectrons, and photoelectric current.
- Describe the experiments of Hertz, Hallwachs, J.J. Thomson, and Lenard related to the effect.
- State and use the laws of photoelectric emission.
- Explain why wave theory fails to account for the photoelectric effect.
- Apply Planck’s quantum idea and Einstein’s photoelectric equation.
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