11. DUAL NATURE OF RADIATION AND MATTER
The dual nature of radiation and matter is explored through the interactions between electromagnetic energy and electrons. The chapter discusses the emergence of the photoelectric effect, established by Hertz and further examined by Hallwachs and Lenard, leading to Einstein's theoretical formulation. Additionally, it delves into the implications of wave-particle duality, as exemplified by de Broglie's hypothesis on matter waves.
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11.3Photoelectric Effect
The photoelectric effect describes how electrons are emitted from a metal...
What we have learnt
- The work function determines the minimum energy required for electron emission from a metal surface.
- Photoelectric effect occurs when light of suitable frequency is incident on a metal, causing electron emission.
- Radiation demonstrates dual wave-particle nature: wave behaviors in phenomena such as diffraction and particle behaviors in the photoelectric effect.
Key Concepts
- -- Work Function
- The minimum energy required by an electron to escape from the surface of a metal.
- -- Photoelectric Effect
- The emission of electrons by metals when illuminated by light of suitable frequency.
- -- Threshold Frequency
- The minimum frequency of incident light below which no photoelectric emission occurs.
- -- de Broglie Wavelength
- The wavelength associated with a particle, showing the dual nature of matter, related to its momentum.
- -- Einstein's Photoelectric Equation
- An equation that relates the energy of photons to the work function and maximum kinetic energy of emitted electrons.
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