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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.

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Does a photon also come to rest after some time while travelling through a medium?

If you fire a bullet in air, after some time it comes to rest because of air resistance forces. But what about photons? If they are also particles, then the same thing should happen with them. It doe …
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