The *de Broglie wavelength* is a fundamental concept in quantum mechanics that describes the wave-like nature of matter. According to it, any particle with [[Momentum|momentum]] $p$ has an associated [[Wavelength|wavelength]] given by: $\lambda = h / p\ .$ In this relation, $\lambda$ is the de Broglie wavelength and $h$ is [[Planck's Constant|Planck's constant]]. This means that not only light but also [[Electron|electrons]], [[Atom|atoms]], and even macroscopic objects exhibit wave-like behavior, though for large with large mass and large momentum objects, the wavelength is too small to observe. That wave-like nature of matter was confirmed experimentally in electron diffraction experiments. In modern physics, the *de Broglie wavelength* plays a crucial role in [[Quantum Mechanics|quantum mechanics]], particularly in explaining phenomena like the [[Double Slit Experiment|double slit experiment]] and the behavior of particles in quantum wells. >[!read]- Further Reading > - [[Double Slit Experiment]] > - _The Nobel Prize in Physics 1929_, [https://www.nobelprize.org/prizes/physics/1929/summary/](https://www.nobelprize.org/prizes/physics/1929/summary/). >[!ref]- References > - L. D. Broglie, Recherches sur la théorie des Quanta, Ann. Phys. **10**, 3 (1925).