What is quantum tunneling?
Quick Answer
Quantum tunneling is the ability of a particle to pass through a barrier that it classically should not be able to cross. It happens because particles also behave like waves.
The Full Story
Quantum tunneling is a striking consequence of quantum mechanics in which there is a nonzero probability that a particle crosses an energy barrier even when it lacks enough classical energy. This occurs because particles are described by wavefunctions, which can extend into and beyond barriers. Tunneling helps explain alpha decay in radioactive nuclei and is essential in technologies like scanning tunneling microscopes and some semiconductor devices. It also plays a role in nuclear fusion inside stars.
Key Facts
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Suggested video title for this topic:
"How particles can slip through walls in the quantum world"
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