Electromagnetic radiation visible light

Different types of electromagnetic radiation make up the electromagnetic spectrum. Visible light - the radiation that our eyes can detect - makes up only a small part of the electromagnetic spectrum. 

Arrange the following types of photons of electromagnetic radiation in order of increasing frequency radio waves, infrared radiation, visible light, ultraviolet radiation. 

The speed of operation is interlinked with the properties of electromagnetic radiation at the corresponding frequencies. The frequencies of operation in modem IT devices have reached some GHz in the region of microwave radiation. A further increase would step to infrared radiation, visible light and so on see Fig. 1. 

Figure 3.14 The electromagnetic spectrum, showing the frequency and wavelength of the radiations. Visible light encompasses the 400-700-nm band.

When the term light is used, normally it refers to visible light. Like other forms of radiation, visible light is composed of an electrical field that lies perpendicularly to a magnetic field—and thus it is called electromagnetic radiation. 

IR radiation, visible light, radio waves, and X-rays are all forms of radiated electromagnetic energy, and all obey the same laws. The only fundamental difference between them is their wavelength (or frequency, which is equivalent) and how they interact with optical materials, including the atmosphere. This is shown in the chart of the electromagnetic spectrum in Figure 1.1. 

Electromagnetic radiation of which visible light is but one example has the properties of both particles and waves The particles are called photons, and each possesses an amount of energy referred to as a quantum In 1900 the German physicist Max Planck proposed that the energy of a photon (E) is directly proportional to its frequency (v)... 

Electromagnetic radiation (Section 13 1) Vanous forms of ra diation propagated at the speed of light Electromagnetic radiation includes (among others) visible light infrared ul traviolet and microwave radiation and radio waves cos mic rays and X rays... 

Colorimetry, in which a sample absorbs visible light, is one example of a spectroscopic method of analysis. At the end of the nineteenth century, spectroscopy was limited to the absorption, emission, and scattering of visible, ultraviolet, and infrared electromagnetic radiation. During the twentieth century, spectroscopy has been extended to include other forms of electromagnetic radiation (photon spectroscopy), such as X-rays, microwaves, and radio waves, as well as energetic particles (particle spectroscopy), such as electrons and ions. ... 

The so-called peak power delivered by a pulsed laser is often far greater than that for a continuous one. Whereas many substances absorb radiation in the ultraviolet and infrared regions of the electromagnetic spectrum, relatively few substances are colored. Therefore, a laser that emits only visible light will not be as generally useful as one that emits in the ultraviolet or infrared ends of the spectrum. Further, witli a visible-band laser, colored substances absorb more or less energy depending on the color. Thus two identical polymer samples, one dyed red and one blue, would desorb and ionize with very different efficiencies. 

---