Here is a brief summary of the electron chapter of class 12 :
Introduction: The chapter starts with an introduction to the discovery of electrons and their properties.
Discovery of Electron: J.J. Thomson's cathode ray experiment is discussed in detail. The experiment led to the discovery of electrons and their properties.
Properties of Electron: The chapter covers various properties of electrons such as charge, mass, spin, magnetic moment, and specific charge.
Cathode Ray Oscilloscope: The chapter also covers the working principle of the cathode ray oscilloscope and its applications.
Electron Emission: The process of electron emission is explained in detail, including thermionic emission, field emission, and photoelectric emission.
Photoelectric Effect: The chapter covers the photoelectric effect and its experimental observations, including the threshold frequency and stopping potential.
Atomic Models: The chapter covers the atomic models proposed by various scientists, including Rutherford's model and Bohr's model.
Quantum Mechanical Model of Atom: The chapter concludes with a brief introduction to the quantum mechanical model of the atom.
In summary, the electron chapter of class 12 covers the discovery of electrons and their properties, the cathode ray oscilloscope, electron emission, the photoelectric effect, atomic models, and the quantum mechanical model of the atom. It is an important chapter that forms the foundation for the study of modern physics.
