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Quantum physics, or quantum mechanics, is the branch of physics that describes the behavior of matter and energy at very small scales, such as atoms and subatomic particles. Unlike classical physics, which works well for larger objects like planets and cars, quantum physics deals with phenomena that are often counterintuitive and strange. Key Principles of Quantum Physics: 1. Wave-Particle Duality: Particles, like electrons or photons, can behave both as particles and as waves. This dual nature means that sometimes they act like discrete particles, but other times they display wave-like characteristics, such as interference. 2. Quantum Superposition: A particle can exist in multiple states at the same time until it is observed or measured. This concept is famously illustrated by Schrödinger's cat thought experiment, where a cat can be both alive and dead until someone observes it. 3. Quantum Entanglement: Particles can become entangled, meaning their states are linked no matter how far apart they are. A change in one entangled particle instantly affects the other, regardless of distance. This "spooky action at a distance," as Einstein called it, suggests that information can be transferred faster than the speed of light. 4. Heisenberg's Uncertainty Principle: It is impossible to know both the exact position and the exact momentum of a particle simultaneously. The more precisely you know one, the less precisely you can know the other. This uncertainty is not due to measurement limitations but is a fundamental property of quantum systems. 5. Quantum Tunneling: Particles can pass through barriers that, according to classical physics, they should not be able to cross. This phenomenon, called tunneling, plays a crucial role in many processes, such as nuclear fusion in stars and semiconductor devices.