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Light is a complex phenomenon that is classically explained with a simple model based on rays and wavefronts.

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Scientists’ discovery that photons are both waves and particles was a key part of the development of quantum mechanics. Isaac Newton thought light traveled in particles in part because of how light bounces off surfaces. But Christian Huygens pointed out that light shined through a small hole spread out instead of remaining a spot. This meant that light must be a wave, with light spreading out in a way similar to how water ripples. Huygens’ wave model gained additional support from experiments in the 1800s.

Electromagneticspectrum

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In 1900, Max Planck suggested instead that photons must be particles because of the way radiation behaves. This opened the door for Einstein to suggest in 1905 that light is both particles and waves. His explanation is based on the photoelectric effect. This is the way a sheet of metal emits electrons when hit with light. Einstein demonstrated that the intensity of the light shined on the metal is tied to the number of photons in the light. The frequency (or color) of the light is tied to the amount of energy each photon carries.

The DOE Office of Nuclear Physics in the Office of Science supports research to understand all forms of nuclear matter and the subatomic particles that make up atomic nuclei. This research includes unraveling previously unknown properties of atoms and the subatomic particles they are composed of in their natural state. This work has important applications in medicine, commerce, and national defense. Another area of study is understanding precisely how nuclei are structured depending on the number of protons and neutrons inside them. Still other research focuses on heating nuclei to the temperature of the early universe to understand how they condensed out of the quark-gluon soup that existed at the time. Separately, the DOE Office of Science operates a series of light sources that use the power of photons for scientific research. These light sources are Office of Science user facilities open to researchers from industry, academia, and the national laboratories.

Speedof light

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Photons are the smallest possible particles of electromagnetic energy and therefore also the smallest possible particles of light. Photons can travel at the speed of light because they have no mass (thanks to relativity). Photons also have no charge.

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Like many other particles governed by quantum mechanics, photons have the characteristics of both waves and particles. Photons travel in a wave-like fashion, in which the local electric and magnetic field oscillates in intensity, regularly swinging back and forth between high and low energy levels. The energy in the photons determines the type of electromagnetic radiation the photons transmit. This means low-energy photons carry radio waves. Radio waves are called long-wavelength because the bottoms and crests of the waves are relatively far apart. High-energy photons carry gamma waves. Gamma waves are called short-wavelength because the bottoms and crests of their waves are very close together.

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Scientific terms can be confusing. DOE Explains offers straightforward explanations of key words and concepts in fundamental science. It also describes how these concepts apply to the work that the Department of Energy’s Office of Science conducts as it helps the United States excel in research across the scientific spectrum.

Visiblelightspectrum

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Photons represent the entire spectrum of electromagnetic radiation. This includes radio waves, gamma-rays, and visible light.

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