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1. Introduction
For photocopying of material in this volume, please pay a copying fee through the Copyright Clearance Center, Inc. In this case permission to photocopy is not required from the publisher. Typeset by Stallion Press Email: enquiries stallionpress. KahFee - - Quantum Field Theory. From Classical Physics to Modern Physics The classical mechanics is valid for systems where all velocities are much less than the velocity of light.
Worl the velocities are close to the velocity of light, the classical mechanics must be replaced by the relativistic mechanics, introduced by Albert Einstein in The Lorentz transformations are transformations between the space-time coordinates of one system of reference and another one. The Lorentz transformations can be regarded as rotations in the four-dimensional space-time. The theory of classical electrodynamics was introduced by James Clerk Maxwell in The basic equations of electrody- namics source the Maxwell equations.
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Quantum Mechanics Besides relativistic mechanics, quantum mechanics is another important branch of modern physics. Quantum physics started inwhen Max Planck wrote a paper on the quantization of the energy in electromagnetic processes.
He introduced the new funda- mental constant h. In Albert Einstein proposed that the energy of light is quantized.
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Light is a collection of particles, which are called photons. In Louis de Broglie published a theory of matter waves. A particle, e.]
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