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Light, that is, visible, infrared, and ultraviolet light, is usually described as though it is a wave. We talk about light being a form of electromagnetic radiation, which travels in the form of waves and has a range of wavelengths and frequencies. Blue light has a smaller wavelength; red light has a longer wavelength. So we know that light has properties of waves. But, at the beginning of the 20th century, scientists had begun to question the wavelike nature of light. They had found new evidence to suggest that light was not really a wave, but more like a particle. To solve the problem, famous scientists like Einstein, Hertz and de Broglie had to put their heads together and come up with a better solution for how to think about light. Their contributions led to the current scientific theory of wave-particle duality. Scientists in the 20th century found evidence that light was more like a particle than a wave Light More Like Particle