Quantum mechanics describes small scale phenomena from "summary" of A Brief History of Time by Stephen W. Hawking
Quantum mechanics revolutionized our understanding of the universe by providing a framework to describe the behavior of particles at the smallest scales. At these scales, the classical laws of physics break down, and a new set of rules governs the behavior of matter and energy. The strange and counterintuitive nature of quantum mechanics is a result of the inherent uncertainty and probabilistic nature of quantum systems. One of the key principles of quantum mechanics is the wave-particle duality, which states that particles such as electrons and photons can exhibit both wave-like and particle-like behavior depending on the context. This duality challenges our classical notions of particles as discrete, solid objects with well-defined trajectories. Instead, particles are described by wave functions that represent the probability distribution...
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