Notes of Chapter 19: Dawn of Modern Physics 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.

The term modern physics refers to the post-Newtonian conception of physics. The term implies that classical descriptions of phenomena are lacking, and that an accurate, “modern”, description of reality requires theories to incorporate elements of quantum mechanics or Einsteinian relativity, or both.

• Classical Physics
• Failure of classical physics
• Modern physics
• Relative Motion
• Frame of reference
• Special Theory of relativity
• Applications of special theory of relativity
• Black body radiation
• Interaction of electromagnetic radiations with matter
• Annihilation of matter
• Antimatter
• Wave nature of particles
• Uncertainty principle