Bohr's model is also useful because it explains the cause of light. Bohr agreed with classical theory that light has a wave-particle duality (meaning that it is made of both electromagnetic waves and particles called photons), but he said that light was given off when an electron in a hydrogen atom jumps from a higher energy level to a lower one. Basically, if an electron with "x" amount of energy goes to a lower state of energy and loses "y" energy, then a photon with energy "y" is emitted by the atom and either becomes light or some other form of radiation.= = = Matter wave = = =
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