Wave-particle duality is the concept in quantum mechanics that every particle or quantum entity may be described as either a particle or a wave. In physics and chemistry, wave-particle duality holds that light and matter exhibit properties of both waves and of particles. The explanation marked one of the major steps toward quantum theory. Through the work of Albert Einstein, Louis de Broglie and many others, it is now authenticated that all objects have both wave and particle nature and that a suitable understanding of quantum mechanics provides the over-arching theory resolving this notable paradox.

### Wave-particle duality

Wave-particle duality is the concept in quantum mechanics that every particle or quantum entity may be described as either a particle or a wave. It expresses the inability of the classical concepts particle or wave to fully describe the behaviour of quantum-scale objects. According to wave-particle theory, light has the property of both wave and particle.

### Particle and wave nature of wave

Wave-Particle Duality helps us to understand the particle and wave nature of light. Based on the idea that light and all other electromagnetic radiation may be considered a particle or a wave nature, in 1923 physicists Louis De Broglie suggested that the same kind of duality must be applicable to the matter. He proposed that any particle of matter having momentum (p) Has an associated wavelength (λ).

De Broglie Wavelength formula is given by λ= h/p

Where h is the Planck constant

for a particle of momentum mv, the wavelength is given by λ=h/mv

This equation is also applicable for photons too.