PDF | The electromagnetic spectrum is the complete spectrum (or continuum) of all forms of “light” An electromagnetic wave consists of electric. The Electromagnetic Spectrum. CESAR's Booklet. 2. The electromagnetic spectrum. The colours of light. You have surely seen a rainbow, and you are probably. The electromagnetic spectrum is the distribution of electromagnetic radiation according to energy, fre- quency, or wavelength. The electro-magnetic radiation.
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The Electromagnetic Spectrum. This flipchart has been adapted from original work, distributed by download or viewed on the Internet, as a free GCSE physics . Light the Messenger. Key Ideas: Light is Electromagnetic Radiation. Light as Waves and Photons. Electromagnetic Spectrum. • Sequence of photon energies. Introduction to the Electromagnetic Spectrum. Editor: Daniel Finkenthal. Written by: Daniel Finkenthal. Beverly Greco. Rick Halsey. Lori Pena. Steve Rodecker.
Many objects, both natural and man-made, emit radio waves.
Anything that emits heat emits radiation across the entire spectrum, but in different amounts. Stars, planets and other cosmic bodies emit radio waves. Radio and television stations and cellphone companies all produce radio waves that carry signals to be received by the antennae in your television, radio or cellphone.
Whereas radio waves can be up to miles in length, microwaves measure from a few centimeters up to a foot. Due to their higher frequency, microwaves can penetrate obstacles that interfere with radio waves such as clouds, smoke and rain. Microwaves carry radar, landline phone calls and computer data transmissions as well as cook your dinner. Microwave remnants of the "Big Bang" radiate from all directions throughout the universe.
The size of infrared waves ranges from a few millimeters down to microscopic lengths. The longer-wavelength infrared waves produce heat and include radiation emitted by fire, the sun and other heat-producing objects; shorter-wavelength infrared rays do not produce much heat and are used in remote controls and imaging technologies. The different frequencies of visible light are experienced by people as the colors of the rainbow. The frequencies move from the lower wavelengths, detected as reds, up to the higher visible wavelengths, detected as violet hues.
The most noticeable natural source of visible light is, of course, the sun. The EM spectrum EM radiation spans an enormous range of wavelengths and frequencies.
This range is known as the electromagnetic spectrum. The EM spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency. The common designations are: radio waves, microwaves, infrared IR , visible light, ultraviolet UV , X-rays and gamma rays. Typically, lower-energy radiation, such as radio waves, is expressed as frequency; microwaves, infrared, visible and UV light are usually expressed as wavelength; and higher-energy radiation, such as X-rays and gamma rays, is expressed in terms of energy per photon.
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. Credit: Biro Emoke Shutterstock Radio waves Radio waves are at the lowest range of the EM spectrum, with frequencies of up to about 30 billion hertz, or 30 gigahertz GHz , and wavelengths greater than about 10 millimeters 0.
Radio is used primarily for communications including voice, data and entertainment media. They have frequencies from about 3 GHz up to about 30 trillion hertz, or 30 terahertz THz , and wavelengths of about 10 mm 0. Microwaves are used for high-bandwidth communications, radar and as a heat source for microwave ovens and industrial applications.
Infrared Infrared is in the range of the EM spectrum between microwaves and visible light. IR light is invisible to human eyes, but we can feel it as heat if the intensity is sufficient.
It has frequencies of about THz to THz and wavelengths of about nm 0. More generally, visible light is defined as the wavelengths that are visible to most human eyes.
Ultraviolet Ultraviolet light is in the range of the EM spectrum between visible light and X-rays.
UV light is a component of sunlight; however, it is invisible to the human eye. It has numerous medical and industrial applications, but it can damage living tissue. X-rays X-rays are roughly classified into two types: soft X-rays and hard X-rays.
Hard X-rays occupy the same region of the EM spectrum as gamma rays. The only difference between them is their source: X-rays are produced by accelerating electrons, while gamma rays are produced by atomic nuclei.
Gamma-rays Gamma-rays are in the range of the spectrum above soft X-rays.
Gamma radiation causes damage to living tissue, which makes it useful for killing cancer cells when applied in carefully measured doses to small regions. Uncontrolled exposure, though, is extremely dangerous to humans.