4/30/2023 0 Comments Radiant energy definition![]() Radio is used primarily for communications, including voice, data and entertainment media. Radio waves are at the lowest range of the electromagnetic spectrum, with frequencies of up to about 30 billion hertz, or 30 gigahertz (GHz), and wavelengths greater than about 0.4 inch (10 millimeters). The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays and gamma-rays. The electromagnetic spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency. This range is known as the electromagnetic spectrum, according to UCAR (opens in new tab). (Image credit: Shutterstock)Įlectromagnetic radiation spans an enormous range of wavelengths and frequencies. The electromagnetic spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. The electromagnetic spectrum, from highest to lowest frequency waves. ![]() In simple terms, these four equations state the following: ![]() Though there were initially 20 equations, Maxwell later simplified them to just four basic ones. Maxwell developed a set of formulas, called Maxwell's equations, to describe the different interactions of electricity and magnetism. The study of electromagnetism deals with how electrically charged particles interact with each other and with magnetic fields. In 1873, Scottish physicist James Clerk Maxwell showed that the two phenomena were connected and developed a unified theory of electromagnetism, according to Live Science sister site (opens in new tab). People have known about electricity and magnetism since ancient times, but the concepts were not well understood until the 19th century, according to a history (opens in new tab) from physicist Gary Bedrosian of the Rensselaer Polytechnic Institute in Troy, New York. Magnetic and electric fields of an electromagnetic wave are perpendicular to each other and to the direction of the wave. These situation-specific forms of measurement are more useful for understanding ionization hazards than is the more generic concept of radiant energy.Electromagnetic waves are formed when an electric field (shown in red arrows) couples with a magnetic field (shown in blue arrows). They are instead described in terms of subject-specific units such as becquerels (amount of activity), coulombs/kilogram (amount of exposure), grays (absorbed dose), and sieverts (dose equivalent). However, measurements related to ionizing radiation are not usually described in terms of radiant energy. This form of radiation can cause cancer and other illnesses. Ionizing radiation, such as gamma radiation, can also be described as radiant energy. Industrial lasers also emit a higher-energy form of radiation, and even short lengths of exposure may be sufficient to injure workers if appropriate eye protection is not worn. Any significant length of optical exposure to the high levels of visible radiation emitted by activities such as welding requires the use of mandatory PPE eyewear to prevent eye damage. The non-thermal contexts in which radiant energy plays a significant role are primarily those related to the potential harmful exposure to visible light, including exposure to lasers. Threshold limit values for exposure to environmental heat are described with reference to “wet-bulb globe temperature,” a measurement of apparent temperature that accounts for the role radiant energy plays in producing environmental heat. ![]() For example, the temperature experienced by humans (called apparent temperature) is heavily influenced by sources of visible and infrared radiation (e.g., sunlight, fire). Radiant energy is chiefly relevant to occupational health and safety issues involving heat and light.
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