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also determines the frequency of the energy given off by an atom. The energy released by this process is called a photon. The higher the energy level the atom attains, the more energy is released when it drops back down to its starting level. Therefore photons are not all the same. This energy-level theory serves to explain how light can be produced by very hot objects such as a burning log, the filament of an incandescent bulb and the Sun (Halliday et el., 2003). Figure 5: The drop of an electron from a higher energy level to a lower energy level resulting in a release of energy in the form of a photon (Cutnell and Johnson, 2001) 2.2.3 Electromagnetic Radiation The previous section indicates that visible light (electromagnetic waves between 390 nm and 740 nm) consists of streams of photons and has differing frequencies and wavelengths. For this reason, light is considered part of a much larger class of waves known as electromagnetic waves. There is no limit to how short or how long the wavelengths of electromagnetic radiation can be. The principle source of this radiation is from the Sun. A detailed representation of the Electromagnetic Spectrum can be found in Appendix A 2.2.3.1 Electromagnetic Wave An electromagnetic wave is a transverse wave because the magnetic and electric fields are perpendicular to the direction in which the wave travels. 13PDF Image | THE USE OF LIGHT AND COLOUR AS A HEALING MODALITY
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