Electromagnetic Spectrum WHAT IS IT The electromagnetic spectrum

WHAT IS IT? • The electromagnetic spectrum is the complete spectrum or continuum of

RADIO WAVES • • • Low energy waves with long wavelengths Includes FM, AM,

RADIO WAVES � Longest wavelength EM waves � Uses: � TV broadcasting � AM

MICROWAVES � Wavelengths from 1 mm- 1 m � Uses: � Microwave ovens �

INFRARED RADIATION � Wavelengths in between microwaves and visible light � Uses: � Night

The only portion of EM wave able to be detected by the human eye.

ULTRAVIOLET � Shorter wavelengths than visible light � Uses: � Black lights � Sterilizing

X-RAYS � Tiny wavelength, high energy waves � Uses: � Medical imaging � Airport

GAMMA RAYS � Smallest wavelengths, highest energy EM waves (blocked by ionosphere) � Uses

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Electromagnetic Spectrum

WHAT IS IT? • The electromagnetic spectrum is the complete spectrum or continuum of light including radio waves, infrared, visible light, ultraviolet light, Xrays and gamma rays • An electromagnetic wave consists of electric and magnetic fields which vibrates thus making waves.

RADIO WAVES • • • Low energy waves with long wavelengths Includes FM, AM, radar and TV waves Wavelengths of 10 -1 m and longer Low frequency Used in many devices such as remote control items, cell phones, wireless devices, etc.

RADIO WAVES � Longest wavelength EM waves � Uses: � TV broadcasting � AM and FM broadcast radio � Avalanche beacons � Heart rate monitors � Cell phone communication

MICROWAVES � Wavelengths from 1 mm- 1 m � Uses: � Microwave ovens � Bluetooth headsets � Broadband Wireless Internet � Radar � GPS

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.

VISIBLE LIGHT

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 (700 nm). 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— (400 nm).

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

X-RAYS � Tiny wavelength, high energy waves � Uses: � Medical imaging � Airport security � Inspecting industrial welds

GAMMA RAYS � Smallest wavelengths, highest energy EM waves (blocked by ionosphere) � Uses � Food irradiation � Cancer treatment � Treating wood flooring