In physics, quantum refers to discrete packets or bundles of energy. It is the fundamental unit of energy that can be gained or lost by an atom or subatomic particle.
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A photon is a quantum of light or electromagnetic radiation. It behaves both as a particle and a wave.
Energy Quantization: Energy quantization refers to the concept that energy levels in atoms are discrete rather than continuous, meaning they can only exist at specific values rather than any value within a range.