How is light born?
Whether light comes from the Sun, fire, a light bulb, or a firefly, light is created by the action of atoms. An atom consists of a heavy nucleus containing neutrons and protons, surrounded by a cloud of electrons orbiting around the nucleus.
If an electron is given extra energy, it will absorb the energy, become excited, and lump' to a higher level. As it does so, it gives off light energy in the form of photons. Electrons in different atoms give off light energy in different wavelengths that produce different colours.
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