Electromagnetic Spectrum

Topics: Electromagnetic radiation, Electromagnetic spectrum, Light Pages: 7 (2258 words) Published: May 11, 2000
The electromagnetic spectrum is made up of six different types of waves. Radio waves, Microwaves, Infrared waves, Visible light, Ultraviolet light, X-rays and Gamma rays. The radio waves are used to transmit radio and television signals. The infrared waves are used to tell temperature of areas. Visible light is all the colors that we can see. Ultraviolet light can help things grow but to much can cause diseases such as skin cancer. X-rays are used as a tool to find broken bones or take pitchers of our sun. Gamma rays are used in medical science but they are often used

to produce images of our universe. If you would like to know more about the spectrum keep reading.

The electromagnetic spectrum is the organization of six different

wavelengths. Each having their own use. The spectrum in order from longest to shortest wavelengths is: Radio waves, Microwaves, Infrared waves, Visible light, Ultraviolet light, X-rays and Gamma rays. The most familiar forms of the spectrum are radio waves and light waves. The reason for that is, that we listen to the radio or use its waves more often than we think. For instance cell phones work off of radio waves. Light waves are used more often than we think because with out light we wouldent posibly be able to see color on any thing, or we wouldent have photosynthisis which sunlight is used for. The term spectrum refers to light in general or the whole range of electromagnetic radiation. The electromagnetic field was found in the 19th centurie. It was founded by James Clerk MAXWELL of Scotland and published in 1865. The field is described in two quantities the electric component E and the magnetic component B and both charge in space and time. This meaning electric / magnetic / spectrum.

Radio waves are used to transmit radio and television signals. Radio waves can send sounds at the speed of light. The range of radio waves can be less than a centimeter to tens or even hundredths of meters. Radio waves are produced by coherent motion of electrons such as the antenna of a radio transmitter. Coherent motion is the focused pattern of the waves, in this case. The radio waves are also produced by charged particles orbiting in magnetic fields. As you already know we have FM and AM radio waves. Well an FM radio station at 100 on the radio dial (100 megahertz) would have a wavelength of about 400 meters. A radio wave can also be used to create images such as portable TVs. Radio waves with wavelengths of a few centimeters can be transmitted from a satellite or airplane antenna. The reflected waves can be used to form an image of the ground in complete darkness or through clouds. This would be how spy satellites work or how we take pictures of the planets surface. Following after radio waves would be the magnificent microwave. The microwave makes up a very small part of the spectrum although it is widely used throughout house holds across the world. Microwaves range from a few centimeters to 0.1 cm. The wave is used to heat your food. It heats your food by bouncing back and fourth across the microwave walls. In the process it causes molecules (tiny particles) to vibrate and create friction which in turn creates heat.

Infrared is the region of the electromagnetic spectrum that extends from the visible region to about one millimeter (in wavelength) Infrared waves include thermal radiation. For example hot or burning charcoal may not give off light but it does send out radiation its just felt as heat. The infrared radiation is or can be measured using detectors . Infrared has many applications in medicine or finding heat leaks in houses. This is what gives us the ability to see in the dark with infrared goggles to tell us what is putting off heat . It is also used in space science exploration to tell us the climate of other planets or even the heat of the sun.

The rainbow of colors we know as...

Bibliography: Grolier Encyclopedia, 1996
ElectrIcity and Magnetism, Prentice-Hall, 1993
Scott Forman, Physical Science Bell and Howell Company 1977
Readers digest-How In The World Library of congress, 1990
Adventures In Scuba Diving, NAUI, 1996
Eric M
Princeton University Press, 1960
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