The Electromagnetic Spectrum

The electromagnetic spectrum is “the entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light.” — Merriam Webster Dictionary

Visible Light

The narrow range of visible light.

“The electromagnetic spectrum (EMS) is the entire distribution of electromagnetic radiation according to frequency or wavelength. Although all electromagnetic waves travel at the speed of light in a vacuum, they do so at a wide range of frequencies, wavelengths, and photon energies. ... The entire EMS, from the lowest to the highest frequency (longest to shortest wavelength), includes all radio waves (e.g., commercial radio and television, microwaves, radar), infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.” — Encyclopaedia Britannica


What Is Electricity? [Electro- is electricity.] Electricity is “a fundamental form of energy observable in positive and negative forms that occurs naturally (as in lightning) or is produced (as in a generator) and that is expressed in terms of the movement and interaction of electrons.” Electricity is also defined as “electric current or power.” — Merriam-Webster


Electricity is the “phenomenon associated with stationary or moving electric charges. Electric charge is a fundamental property of matter and is borne by elementary particles. In electricity the particle involved is the electron, which carries a charge designated, by convention, as negative. Thus, the various manifestations of electricity are the result of the accumulation or motion of numbers of electrons.” – E. E. Suckling


What Is Magnetic? Magnetic means “possessing an extraordinary power or ability to attract; of or relating to a magnet or to magnetism; magnetized or capable of being magnetized; actuated by magnetic attraction.”


Magnetism is “a class of physical phenomena that include the attraction for iron observed in lodestone and a magnet, are inseparably associated with moving electricity, are exhibited by both magnets and electric currents, and are characterized by fields of force. Magnetism is a science that deals with magnetic phenomena; an ability to attract or charm.”


What Is Power? Power is the “ability to act or produce an effect; the capacity for being acted upon or undergoing an effect; the possession of control, authority, or influence over others; a source or means of supplying energy, especially electricity.” Power is the source of energy, which is always subsidiary and relative to its source. Power exerted is transduced to and becomes energy.


What Is the Electromagnetic Spectrum?
By Christopher Crockett

The electromagnetic spectrum describes all the wavelengths of light, both seen and unseen. When you think of light, you probably think of what your eyes can see. But the light to which our eyes are sensitive is just the beginning; it is a sliver of the total amount of light that surrounds us. The electromagnetic spectrum is the term used by scientists to describe the entire range of light that exists. From radio waves to gamma rays, most of the light in the universe is, in fact, invisible to us!
  Light is a wave of alternating electric and magnetic fields. The propagation of light isn’t much different than waves crossing an ocean. Like any other wave, light has a few fundamental properties that describe it. One is its frequency, measured in hertz (Hz), which counts the number of waves that pass by a point in one second. Another closely related property is wavelength: the distance from the peak of one wave to the peak of the next. These two attributes are inversely related. The larger the frequency, the smaller the wavelength — and vice versa.
  The electromagnetic waves your eyes detect — visible light — oscillate between 400 and 790 terahertz (THz). That’s several hundred trillion times a second. The wavelengths are roughly the size of a large virus: 390–750 nanometers (1 nanometer = 1 billionth of a meter; a meter is about 39 inches long). Our brain interprets the various wavelengths of light as different colors. Red has the longest wavelength, and violet the shortest. When we pass sunlight through a prism, we see that it’s actually composed of many wavelengths of light. The prism creates a rainbow by redirecting each wavelength out at a slightly different angle. You can remember the order of the colors in the visible spectrum with the mnemonic ROY G BV.
  But light doesn’t stop at red or violet. Just like there are sounds we can’t hear (but other animals can), there is also an enormous range of light that our eyes can’t detect. In general, the longer wavelengths come from the coolest and darkest regions of space. Meanwhile, the shorter wavelengths measure extremely energetic phenomena.
  Astronomers use the entire electromagnetic spectrum to observe a variety of things. Radio waves and microwaves — the longest wavelengths and lowest energies of light — are used to peer inside dense interstellar clouds and track the motion of cold, dark gas. Radio telescopes have been used to map the structure of our galaxy while microwave telescopes are sensitive to the remnant glow of the Big Bang.
  Infrared telescopes excel at finding cool, dim stars, slicing through interstellar dust bands, and even measuring the temperatures of planets in other solar systems. The wavelengths of infrared light are long enough to navigate through clouds that would otherwise block our view. By using large infrared telescopes, astronomers have been able to peer through the dust lanes of the Milky Way into the core of our galaxy.
  The majority of stars emit most of their electromagnetic energy as visible light, the tiny portion of the spectrum to which our eyes are sensitive. Because wavelength correlates with energy, the color of a star tells us how hot it is: red stars are coolest, blue are hottest. The coldest of stars emit hardly any visible light at all; they can only be seen with infrared telescopes.
  At wavelengths shorter than violet, we find the ultraviolet, or UV, light. You may be familiar with UV from its ability to give you a sunburn. Astronomers use it to hunt out the most energetic of stars and identify regions of star birth. When viewing distant galaxies with UV telescopes, most of the stars and gas disappear, and all the stellar nurseries flare into view.
  Beyond UV come the highest energies in the electromagnetic spectrum: X-rays and gamma rays. Our atmosphere blocks this light, so astronomers must rely on telescopes in space to see the X-ray and gamma ray universe. X-rays come from exotic neutron stars, the vortex of superheated material spiraling around a black hole, or diffuse clouds of gas in galactic clusters that are heated to many millions of degrees. Meanwhile, gamma rays — the shortest wavelength of light and deadly to humans — unveil violent supernova explosions, cosmic radioactive decay, and even the destruction of antimatter. Gamma ray bursts — the brief flickering of gamma ray light from distant galaxies when a star explodes and creates a black hole — are among the most energetic singular events in the universe.

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References

Beaty, William. Electricity Is Not a Form of Energy, 1999; accessed May 14, 2021.

Britannica, Editors of Encyclopaedia. “Electromagnetic spectrum,” Encyclopedia Britannica, March 11, 2019; accessed May 13, 2021.

Crockett, Christopher. “What Is the Electromagnetic Spectrum?” Space. September 7, 2019; accessed May 13, 2021.

Merriam-Webster Dictionary. “Electricity,” Merriam-Webster.com Dictionary; accessed May 14, 2021.

Merriam-Webster Dictionary. “Electromagnetic spectrum.” Merriam-Webster.com Dictionary; accessed May, 13 2021.

Merriam-Webster Dictionary. “Energy,” Merriam-Webster.com Dictionary; accessed May, 14 2021.

Merriam-Webster Dictionary. “Magnetic,” Merriam-Webster.com Dictionary; accessed May, 14 2021.

Merriam-Webster Dictionary. “Magnetism,” Merriam-Webster.com Dictionary; accessed May, 14 2021.

Merriam-Webster Dictionary. “Power,” Merriam-Webster.com Dictionary; accessed May, 14 2021.

Suckling, Eustace E., Robinson, Frank Neville H., McGrayne, Sharon Bertsch and Kashy, Edwin. “Electricity,” Encyclopedia Britannica, November 12, 2020; accessed May 14, 2021.