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ElectroMagnetic Waves

for Science class.

Sydney C

on 21 April 2011

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Transcript of ElectroMagnetic Waves

Electromagnetic Waves By McKenzie and Sydney - a wave produced by the acceleration of an electric charge made by the periodic variation of intensities of perpendicular electric and magnetic fields. Things that transmit electro magnetic waves... Waves in the electromagnetic spectrum vary in size from very long radio waves the size of buildings, to very short gamma-rays smaller than the size of the nucleus of an atom. can be described by their wavelength, energy, and frequency Radio waves they have the longest wavelengths do more than just bring music, they carry signals for TVS and cell phones. Cable companies, have antennaes or dishes that send signal through a cable to houses. Many astronomical objects emit radio waves. Astronomers have developed sophisticated systems that allow them to make pictures from the radio waves trasmitted from astronomical objects. Lights Microwaves X-rays T.V.'s Radios Microwaves Have wavelengths that can be measured in centimeters. The longer microwaves, those closer to a foot in length are the waves that heat our food in a microwaves oven. They are good for transmitting information from one place to another because microwave energy can penetrate haze, light rain, snow, clouds, and smoke. Shorter microwaves are used in remote sensing. These are used in radar for radar like the doppler radar used in weather forcasts. these are just a few inches long. Because radar senses electromagnetic waves that are a reflection of an active transmission, radar is considered an active remote sensing system. Infared Light These lie between the visible and microwave portions of the
electromagnetic spectrum. Infrared light has a range of wavelengths that range from red light to violet. "Near Infrared" light is the closest in wavelength to visible light. "Far infrared" light is closer to the microwave region of the spectrum. "Far infared" waves are thermal. We expeirence this type everday from sunlight, fire, radiator, or a warm sidewalk. Shorter, near infrared waves are not hot at all. You can't see them or feel them. These are the waves used to control your T.V. Visible light These are the only electromagnetic waves that we can see. We see these waves as the colors of the rainbow. Each color in a rainbow corresponds to a different wavelength of electromagnetic spectrum. Red has the longest wave length.
Violet has the shortest. When all of the waves are seen together, they make white light. Water vapor in the atmosphere can also break apart wavelengths creating a rainbow. Cones in our eyes are recievers for these tiny visible light waves. The color of an object that we see is the color of light reflected. We are blind to many wavelenghts of light. Ultraviolet Waves This light has shorter wavelengths than visible light. These are the waves responsible for sunburns. This image is of the sun taken at an extreme ultraviolet wavelength. Review 1. What can electromagnetic waves be described by? wavelength, energy, frequency 2. What are three things that transmit electro magnetic waves? microwaves, X-rays, lights, T.V's, Radios. 3. Which has the longest wave lengths? Radio waves. 4. Which are the only waves that we can see? Visible light 5. When all of the waves are seen together, what do we see? White light 6. Which wavelengths can be measured in centimeters? Microwaves. 7. Which carry waves for T.V's and cell phones? radio waves. Cable companies use cables to transmit tbese waces to your house so you can watch you T.V.
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