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Figure 6: Electromagnetic Wave (Transverse Wave) (Cutnell and Johnson, 2001) Transverse waves are periodic consisting of cycles or patterns that are repeated again and again as they travel through space. An electromagnetic wave does not require a medium, unlike a vibration of a string or a sound wave, in which to propagate. These waves can travel through a vacuum or material, since electric and magnetic fields can exist in either medium. Like any other periodic wave, electromagnetic waves have a frequency and a wavelength that is related to the speed of the wave. The speed of light, and indeed of all electromagnetic radiation in a vacuum, is 3.00 x 108 m/s. Waves give rise to crests (highest point on wave pattern) and troughs (lowest point on wave pattern). The highest or lowest distance the wave reaches above or below the undisturbed position (baseline) is called the amplitude. The wavelength is the horizontal distance between two successive crests. A wavelength can also be referred to as a cycle. The unit of measurement used to denote wavelength is the Nanometre (1Nm = 10-9 meters). The frequency of a wave is the number of cycles per second that passes a given point or location. Electromagnetic waves have a wide range of frequency, from values below 104 Hz to 1024 Hz. This range of frequencies is called the electromagnetic spectrum (Cutnell and Johnson, 2001) Only a small amount of the sun’s energy reaches the surface of our planet. Most of the energy reaching the Earth is reflected by the atmosphere. Therefore solar radiation at ground level is composed of visible light, mid and near ultra-violet (UV rays – 740nm) and shortwave infrared waves (below 390nm) (Liberman & Grbevski, 2001). 14PDF Image | THE USE OF LIGHT AND COLOUR AS A HEALING MODALITY
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