grew out of a series of anomalies in the picture of matter and light offered by
Newtonian physics - in particular associated with
black-body radiation, the photo-electric effect, and the need to devise a model
of the atom consistent with the newly discovered subatomic particles.
principles of quantum theory include its statistical nature, and the
uncertainty principle which sets a limit on our knowledge of physical systems.
The implications of the theory for the nature of reality are much discussed
(see Implications of the new physics). Most quantum theorists accept an
intrinsic element of probability in fundamental physics, and also the need to
see systems as wholes rather than merely dissecting them into their simplest
Contributed by: Dr. Christopher Southgate
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