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Quantum tunneling allows particles to penetrate barriers that would be insurmountable in classical physics from "summary" of Simply Quantum Physics by DK
Quantum tunneling is a remarkable phenomenon that defies the laws of classical physics. It allows particles to pass through barriers that would be impossible to overcome in the classical world. Imagine a particle approaching a barrier that it doesn't have enough energy to surmount. In classical physics, the particle would simply bounce off the barrier and be unable to pass through. However, in the quantum realm, the particle can tunnel through the barrier as if it didn't even exist. This seemingly magical ability is made possible by the wave-like nature of particles in quantum mechanics. According to the laws of quantum physics, particles such as electrons can exhibit wave-like behavior, which allows them to spread out and exist in multiple places at once. As a result, there is a small probability that the particle can be found on the other side of the barrier, even though it technically shouldn't have enough energy to get there. Quantum tunneling has been experimentally verified and plays a crucial role in many modern technologies. For example, it is essential for the operation of devices such as tunnel diodes and scanning tunneling microscopes. In the field of nuclear fusion, quantum tunneling is responsible for enabling the fusion of atomic nuclei at temperatures lower than would be predicted by classical physics. The implications of quantum tunneling are profound and challenge our intuitive understanding of the physical world. It demonstrates the bizarre and counterintuitive nature of quantum mechanics, where particles can behave in ways that seem impossible according to classical physics. As we delve deeper into the mysteries of the quantum realm, we continue to uncover new and fascinating phenomena that stretch the limits of our imagination.
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