Quantum Mechanics introduction, Lecture notes of Quantum Mechanics

Download Quantum Mechanics introduction and more Lecture notes Quantum Mechanics in PDF only on Docsity! Lecture Module - 1 PH 107: Quantum Physics and applications Introduction to Quantum Theory Quantum Theory (1901)? Birth of Quantum Physics (Quantum Mechanics) Theory which questions the “Wave ONLY” Nature of light (electromagnetic wave) Why was it needed? Quantization of ENERGY Quantum Theory • Black-body radiation (1860-1901) • Photoelectric Effect (1887-1905) • Hydrogen Spectra (1888-1913) (1901) By 1900, some discoveries were NOT explained by the “Classical Theory” of Light • Black-body radiation (1860-1901) • Photoelectric Effect (1887-1905) • Hydrogen Spectra(1888-1913) Johannes Rydberg Atomic Spectra of Hydrogen Lyman, Balmer, Paschen, etc series 𝟏 𝝀𝐯𝐚𝐜 = 𝑹𝑯 𝟏 𝒏𝟏 𝟐 − 𝟏 𝒏𝟐 𝟐 wavelength  (Niels) Bohr model of Hydrogen atom (1888) (1913) Atomic Spectra The Nobel Prize in Physics 1922 • Black-body radiation (1860-1901) • Photoelectric Effect (1887-1905) • Atomic Spectroscopy (1888-1913) Photoelectric Effect Failure of Classical theory of light: Frequency, NOT Intensity decides the threshold of photoelectron emission 𝑲𝐦𝐚𝐱 𝑲𝐦𝐚𝐱 = 𝒉𝝂 − 𝝓𝟎 Einstein’s quantization of Photon energy (1905) Hertz (1887) The Nobel Prize in Physics 1921 = 𝒉𝝂 − 𝒉𝒇𝟎 = 𝒆𝑽𝟎 𝑲𝐦𝐚𝐱 = 𝒉(𝝂 − 𝒇𝟎)