Quantum Theory: Photoelectric Effect

This lecture covers the transition from classical physics to quantum theory at the end of the 19th century, focusing on the photoelectric effect. It starts with the limitations of classical physics in explaining radiation spectra and the ultraviolet catastrophe. The development of Planck's theory, the quantization of energy, and the concept of photons by Einstein are discussed. The lecture explains the experimental observations of the photoelectric effect, the quantization of energy in light, and the emission of electrons from a metal surface. It also explores the relationship between light intensity, frequency, and the kinetic energy of emitted electrons.