Photon concept

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Antiparticles - ...ll just “particles”. For example, a particle and its antiparticle have exactly the same mass and both fall downwards in the earth’s gravitational field. The antiparticle of the electron is called a positron, and it has the same mass as the electron, but the opposite...

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Forces and Interactions - ...ong compared to the size of a nucleus. Other forces have much shorter ranges. For example, the forces that hold protons and nucleons together in the nucleus are forces with a small range, in practice about 13 10- cm. These are basically the same forces that bind the quarks in ...

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