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Wave-Particle Duality

The photo-electric effect showed that under certain circumstances light can behave in a particle-like manner rather than its usual wave-like manner. The next step in the development of a quantum view of the world was due to an aristocratic French physicist, Prince Louis de Broglie.

If light can sometimes be particle-like, might there not conversely be situations in which sub-atomic particles behave in a wave-like manner? De Broglie set out to search for such behaviour. He found that, if you take a beam of electrons and pass it through a pair of slits (a classical wave experiment), you get diffraction and interference - properties characteristic of a wave rather than a particle. If you reduce the intensity of the electron beam to a single electron at a time, the detector on the other side of the slits will still gradually accumulate a trace that looks like an interference pattern. Explaining this in classical terms is impossible - if the electrons go through one slit or the other the pattern would look quite different.

There is a good discussion of the two-slit experiment in terms of quantum theory in Paul DaviesGod and the New Physics, p108-111.

Email link | Feedback | Contributed by: Dr. Christopher Southgate
Source: God, Humanity and the Cosmos  (T&T Clark, 1999)

Quantum Physics and Theology

Index - God, Humanity and the Cosmos, 1999 T&T Clark

Wave-Particle Duality

Related Book Topics:

The Ultraviolet Catastrophe
The Photoelectric Effect
Collapsing Atoms
The Quantum Revolution
The Schrödinger Wave Equation
The Heisenberg Uncertainty Principle
The EPR Paradox
Shaking the Foundations: The Implications of Quantum Theory
Schrödinger’s Cat and the Meaning of Quantum Theory
Does God Collapse the Wave Function?
The Hidden-Variable Theory of David Bohm
The Many-Worlds Interpretation
The Rediscovery of the Observer


Dr. Lawrence Osborn and Dr. Christopher Southgate in God, Humanity and the Cosmos. Published by T&T Clark.

See also:

Albert Einstein
Niels Bohr
Werner Heisenberg
Physics and Cosmology
The Relation of Science & Religion
A Dialogue of Scientists and Theolgians
At Home in the Quantum Universe
Books on Physics and Theology