Quantum Mechanics

The physical theory describing matter and energy at atomic and subatomic scales, including quantum states, quantization, and wave mechanics.

Articles with this tag: 3 Updated: August 7, 2026

Articles with this tag

Energy level (electron orbitals and quantized states) Energy level Explanation of electronic energy levels: quantization, bound and continuum states, degeneracy, atomic and molecular examples, spectroscopy, and practical importance.

Max Planck: founder of quantum theory and influential German physicist Max Planck Overview of Max Planck (1858–1947), his role in establishing quantum theory, main contributions, career highlights, Nobel recognition, and lasting scientific legacy.

Planck constant

Planck constant Fundamental physical constant linking a photon's energy to frequency; central to quantum mechanics and the modern SI system, often used in the form ħ = h/2π.