Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025
Definition
Quantum mechanics is a fundamental theory in physics that describes the behavior of particles at atomic and subatomic scales. It explains phenomena that cannot be accounted for by classical physics.
Quantum mechanics introduces the concept of wave-particle duality, where particles like electrons exhibit both wave-like and particle-like properties.
Heisenberg's Uncertainty Principle states that it is impossible to simultaneously know both the exact position and exact momentum of a particle.
The Schrödinger equation is a key mathematical equation in quantum mechanics that describes how the quantum state of a physical system changes over time.
Quantum superposition allows particles to exist in multiple states or positions simultaneously until they are measured or observed.
Entanglement is a phenomenon where particles become interconnected such that the state of one particle instantly influences the state of another, regardless of distance.
A principle in quantum mechanics asserting that it is impossible to simultaneously determine with perfect accuracy both the position and momentum of a particle.