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WHAT IS IT?
• The electromagnetic spectrum is the complete spectrum or continuum of light including radio waves, infrared, visible light, ultraviolet light, X-rays and gamma rays
• An electromagnetic wave consists of electric and magnetic fields which vibrates thus making waves.
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RADIO WAVES
• Low energy waves with long wavelengths• Includes FM, AM, radar and TV waves• Wavelengths of 10-1m and longer• Low frequency • Used in many devices such as remote
control items, cell phones, wireless devices, etc.
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RADIO WAVES
Longest wavelength EM waves Uses:
TV broadcasting AM and FM broadcast radio Avalanche beacons Heart rate monitors Cell phone communication
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MICROWAVES
Wavelengths from 1 mm- 1 m Uses:
Microwave ovens Bluetooth headsets Broadband Wireless Internet Radar GPS
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INFRARED RADIATION
Wavelengths in between microwaves and visible light
Uses: Night vision goggles Remote controls Heat-seeking missiles Thermogram—a picture that shows
regions of different temperatures in the body. Temperatures are calculated by the amount of infrared radiation given off. Therefore people give off infrared rays.
Heat lamps give off infrared waves.
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VISIBLE LIGHT
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The only portion of EM wave able to be detected by the human eye.
Traditionally, we break white light into red, orange, yellow, green, blue, indigo, and violet (ROY G BIV)
Red light has a frequency of roughly 4.3 × 1014 Hz, and a wavelength of about (700nm).
Violet light, at the other end of the visible range, has nearly double the frequency—7.5 × 1014 Hz—and (since the speed of light is the same in either case) just over half the wavelength—
(400nm).
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ULTRAVIOLET
Shorter wavelengths than visible light Uses:
Black lights Sterilizing medical equipment Water disinfection Used to kill bacteria. (Sterilization of
equipment)
Security images on money
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X-RAYS
Tiny wavelength, high energy waves
Uses: Medical imaging Airport security Inspecting industrial welds
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GAMMA RAYS
Smallest wavelengths, highest energy EM waves (blocked by ionosphere)
Uses Food irradiation Cancer treatment Treating wood flooring