Particles as waves

Proposed that all particles have wave properties, termed as matter-waves. Thus, all objects had both wave and particle aspects. When energy was low, the wave aspect would predominate. When energy was high, the particle aspect would dominate.
 Louis-Victor-Pierre-Raymond de Broglie France 1923 Particles as waves

Proposed that all particles have wave properties, termed as matter-waves. Thus, all objects had both wave and particle aspects. When energy was low, the wave aspect would predominate. When energy was high, the particle aspect would dominate.