Quantum Electrodynamics

The interaction of light with matter

Tristan, Cogapp Pecha Kucha, August 2010

Matter

Light

Schrödinger equation

Electron orbital shells

Energy is quantised

Heisenberg Uncertainty Principle

It is impossible to specify simultaneously, with arbitrary precision, both the momentum and the position of a particle.

Schrödinger’s cat

Two-slit experiment

Refraction of light

Richard Feynman

Feynman diagrams

Time travel

Annihilation and disintegration

Magnetic moment of the electron

99.9999975% accurate

USA Human hair

Summary

• Wave-particle duality• Quantised energy levels• Uncertainty• Time travel• Spontaneous creation and destruction• … but it works.

Further reading

www.bbc.co.uk/archive/feynman/

www.roddis.org/qed