Quantum Mechanics
7 questions tagged Quantum Mechanics — spanning every one of the seven Ws.
What Is a Black Body (in Physics)?
A black body is an idealised object that absorbs all incoming electromagnetic radiation and re-emits it based solely on its temperature.
What Is the Heisenberg Uncertainty Principle?
The Heisenberg uncertainty principle states that it is fundamentally impossible to simultaneously know both the exact position and exact momentum of a particle with arbitrary precision.
What is a virtual particle?
A virtual particle is a temporary quantum entity used to describe interactions between particles. It is not directly observable as a free particle like an electron or photon.
What is a Feynman diagram?
A Feynman diagram is a visual tool used to calculate and picture particle interactions in quantum field theory. It shows how particles exchange force carriers.
How does the uncertainty principle limit what we can know?
Quantum mechanics says some pairs of properties, like position and momentum, cannot both be known exactly at the same time. The more precisely one is measured, the less precisely the other can be known.
Where is the first observation of the Casimir effect usually demonstrated in textbooks and labs?
It is demonstrated in precision physics laboratories, often using closely spaced metal plates or microelectromechanical systems. There is no single original site tied to the effect, but it is a classic quantum-force experiment.
Whose idea explained the wave nature of matter?
Louis de Broglie proposed matter waves in 1924. His idea became a foundation of quantum mechanics.