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It was Max Planck who used the particle theory of light.
John Dalton, an English scientist, proposed the theory that atoms are the smallest particle of an element that retains its chemical properties. His work on atomic theory laid the foundation for modern chemistry.
The particle theory of light, which suggests that light is made up of small particles called photons, was first proposed by Albert Einstein in 1905 to explain the photoelectric effect. This theory revolutionized our understanding of light and helped to explain phenomena that the wave theory of light could not account for. Today, the particle-wave duality of light is a fundamental concept in quantum mechanics.
The quantum theory of light unifies the particle theory of light (photons) and wave theory of light by treating light as both particles and waves. Photons are quantized packets of energy that exhibit particle-like behavior, while light waves exhibit wave-like behavior with properties such as interference and diffraction. Quantum theory provides a framework to understand the dual nature of light.
In string theory, particles are not seen as individual point-like objects, but rather as one-dimensional strings that vibrate at different frequencies. These vibrations give rise to different particle properties, such as mass and charge. Therefore, an individual particle in string theory would be represented by a specific mode of vibration of a string.