CBSE Class 12 Physics Dual Nature of Radiation and Matter — Worksheets & PDF Download

How can light behave both as a wave and as a stream of particles? This fundamental question reshapes our understanding of the physical world. The chapter reveals how early observations by Hertz and Lenard showed that light ejects electrons from metals, a phenomenon classical wave theory could not explain. Einstein resolved this mystery with his photoelectric equation, proposing that light delivers energy in distinct packets. Students learn how this particle model of radiation transitions into a wave model of matter through de Broglie's bold hypothesis, which suggests that material objects possess an inherent wave nature. The Davisson-Germer experiment provides the crucial physical evidence, demonstrating electron diffraction and confirming that matter truly exhibits wave-like behaviour. Grasping this dual nature is vital because it bridges two seemingly opposite views, forming the foundation of modern quantum physics and deepening our comprehension of the microscopic universe.