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Prologue

Electromagnetic Radiation
  • Ionel Rosenthal
Part of the Advanced Series in Agricultural Sciences book series (AGRICULTURAL, volume 19)

Abstract

Electromagnetic radiation can be regarded as having a dual nature. From the time of Newton until the advent of the quantum theory, the predominant apprehension of electomagnetism was the wave theory. The propagation phenomena such as reflection, refraction, diffraction, polarization and, particularly, interference can be explained in terms of propagation of a wave. However, the actual nature of the wave and the mechanism of its propagation were not established until the latter part of the nineteenth century. In the 1860s James Clerk Maxwell made one of the major contributions to physics. He demonstrated by powerful mathematical reasoning that an oscillating magnetic field was associated with a similar electric field, if a wave was propagated in a direction perpendicular to a plane containing these fields. Maxwell’s equations indicated that the velocity of propagation of an “electromagnetic” wave in vacuo is numerically identical to the velocity of light. In 1887 Hertz confirmed Maxwell’s prediction of propagated waves from systems involving oscillating electrical and magnetic fields.

Keywords

Excited State Electromagnetic Radiation Radio Wave Electromagnetic Spectrum Dual Nature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • Ionel Rosenthal
    • 1
  1. 1.Department of Food ScienceAgricultural Research Organization, The Volcani CenterBet DaganIsrael

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