===== Chapter 20: Atomic Spectra ===== Notes of Chapter 20:Atomic Spectra of “Physics XII” for FSc Part 2 published by Punjab Textbook Board, Lahore. These notes are very helpful to prepare Physics paper of FSc Part 2 for Federal Board, Multan Board, Faisalabad Board, Sargodha Board, Gujranwala Board, DG Khan Board, Rawalpindi Board or any other board of Punjab, Pakistan. === Summary and Contents === The branch of physics which deals with the investigations of wavelengts and intensities of electromagnetic radiations emitted or absorbed by atoms is called spectroscopy. * Atomic spectra * Spectroscopy * Types of spectra * Atomic spectra * Historical background * Spectrum of hydrogen * Bohr`s Model * De-Broglie`s interpretation of Bohr`s model * Quantized radii * Quantized energies * Related terms * Hydrogen emission spectrum * Inner shell transitions * Characteristics of x-rays * Transition of electron * Continuous x-ray spectrum * Properties of x-rays * Uses of x-rays * CAT scanner * Biological effects of x-rays * Uncertainty with the atom * LASER * Kinds of LASER * Uses of LASER === View Online & Download ===