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.
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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.
Credit: NASA Electromagnetic EM radiation is a form of energy that is all around us and takes many forms, such as radio waves, microwaves, X-rays and gamma rays. Sunlight is also a form of EM energy, but visible light is only a small portion of the EM spectrum, which contains a broad range of electromagnetic wavelengths. Electromagnetic theory Electricity and magnetism were once thought to be separate forces. However, in , Scottish physicist James Clerk Maxwell developed a unified theory of electromagnetism. The study of electromagnetism deals with how electrically charged particles interact with each other and with magnetic fields.
To study the properties of electromagnetic waves To study the application of electromagnetic waves in daily lie To analyse the detrimental effect of electromagnetic waves To study the components of the electromagnetic spectrum 5. Light e. State examples of the use of the following components: What is electromagnetic waves?
Specific materials give off specific light characteristic of the atomic makeup. What is Electromagnetic Spectrum?
Rays that hit the earth! This is why ultraviolet light can burn your skin and X-rays and gamma rays can damage tissues. Electromagnetic radiation with higher frequency than visible light has higher energy. All radiation travels in waves at Electromagnetic radiation consists of an electric wave E traveling and a magnetic wave M oriented at right angles to the electrical wave.
Electromagnetic waves have an electric part and a magnetic part that are perpendicular to each other None Radar Dangers: Can kill healthy cells.
Heat Lamps. Night Visions Goggles Dangers: Overexposure can cause burns High Frequency Common Uses: Sterilize medical equipment. Can burn. Short wavelength. Kills healthy cells High Frequency Blocked by high density substances Common uses: High Frequency Blocked by lead or concrete Uses: Astronomy research Dangers: Can damage healthy tissue Inside our house: This cathode C is enclosed inside a glass tube.
Lower frequency means it is safe when radiation used in radio waves but if the emitter station placed nearer to the living house it will affect human health. How does emitter station works? The cathode emits rays of electrons into the empty space inside the tube. Then television will transform the wave into images and sounds so that we can enjoy our television program.
The interaction between the electrons and the screen can potentially create low-level x-rays. It is proved by the Planck-Einstein equation: Food molecules. The scientific name for this deformation is structural isomerism. As the microwaves generated from the magnetron bombard the food. The friction also causes substantial damage to the surrounding molecules. It creates molecular friction. How does microwaves works?
Twenty-four hours a day we are exposed to an alarming array of harmful electromagnetic fields. If a people who talking hand phone for a long period. Electromagnetic Waves threats: Simply put. But what about electromagnetic energy fields? Electromagnetic caused brain cancer.
The signals sent out while users are communicating through their hand phones can attract lightning bolts. And unlike some forms of pollution.
Over prolonged periods of time television may cause eye.
It will take some years for the required radiofrequency research to be completed. Significant increases were found in the luminescence of these bacteria when exposed to blood serum obtained after the consumption of microwaved food. Hemoglobin levels decreased and over all white cell levels and cholesterol levels increased. All foods that were processed through the microwave ovens caused changes in the blood of the volunteers.
This unintentional emission of x-rays can pose a potential hazard The uncertain light from television will stimulate an uncertain activity of retina. Avoid standing too close to microwave ovens when they are in use move about 3 meters away. Sit at least 3 meters away from televisions Don't sleep under electric blankets or on a waterbed. Increase the distance between you and the television set. Television o o o o What we might not know is.
FDA advises sitting a distance of at least two to three feet from the screen to limit exposure.
Precautions to avoid electromagnetic radiation: Limit the time spent around the TV. Form 5 Physics Text Book Present brief descriptions. Neat and in proper order. Exhibit various information sufficiently PI 3. Classify information in meaningful sequence PI 4. Exhibit information related to the assignment PI 2.
In a group of two. Always willing to help. To practice safety measure and cleanliness. The movement produces oscillating electric and magnetic fields, which travel at right angles to each other in a bundle of light energy called a photon. Photons travel in harmonic waves at the fastest speed possible in the universe: , miles per second ,, meters per second in a vacuum, also known as the speed of light.
The waves have certain characteristics, given as frequency, wavelength or energy.
Electromagnetic waves are formed when an electric field shown in red arrows couples with a magnetic field shown in blue arrows. Magnetic and electric fields of an electromagnetic wave are perpendicular to each other and to the direction of the wave.
Credit: NOAA. A wavelength is the distance between two consecutive peaks of a wave. This distance is given in meters m or fractions thereof. Frequency is the number of waves that form in a given length of time. It is usually measured as the number of wave cycles per second, or hertz Hz. Similarly, a longer wavelength has a lower frequency because each cycle takes longer to complete.
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.