By Robert Clawson

История русского стального шлема

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In 1904, Albert Einstein conﬁrmed this theory with the discovery of the photo effect, which cannot be explained with classical explanatory approaches [EIN05]. 5) EM waves show frequency-dependent interactions with the surrounding matter, which make them attractive for several applications. 5 $ 1017 to 6 $ 1019 Hz (1 pme10 nm) or microwaves with frequencies from 1 to 300 GHz (1e300 mm). 2 The frequency spectrum of electromagnetic waves. X-rays are used in medical imaging, whereby microwaves are used for heating of watercontaining objects due to the fact that they are able to interact with the dipole moment of water molecules.

The phase velocity is hereby deﬁned as the propagation velocity of a certain component of an EM wave. However, light consists of a variety of wavelengths with certain phase velocities. The EM wave appears as a superposition of waves with several frequencies and phase velocities, which we introduced as a wave package. The resulting envelope of the wave package propagates at a velocity, which is deﬁned as the group velocity [DEM08]. We deﬁned the refractive index as the ratio of the vacuum light velocity and the phase velocity of the wave in a particular medium.

However, as it can be studied in further literature, the quantum-based calculation and the semiclassical theory yield to similar results in many cases. The behaviour of a dipole in an electric ﬁeld is shown in Fig. 10. 1 Complexity of a quantum-mechanical approach As described in the introductory chapter and discussed afterwards, Maxwell’s equations are the basis for each discussion of electrodynamic phenomena. However, the observations of Max Planck and Albert Einstein showed that a neat classical description is not sufﬁcient in order to understand interactions between EM waves and a surrounding medium.