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EM Spectrum

Electromagnetic Spectrum and Signals

TermDefinition
Electromagnetic Spectrum The range of wavelengths or frequencies over which electromagnetic waves extend.
Radio Waves Waves with the longest wavelengths and lowest frequency.
Gamma Rays Waves with the shortest wavelength and the highest frequency.
Ultraviolet Waves Waves that can cause skin cancer. The ozone layer helps protect us from these waves.
X-Rays Waves that are used to take pictures of teeth and bones.
Infrared Waves Waves that give off thermal heat.
Electromagnetic Waves Waves that do not require a medium in order to travel.
Absorption of Light The transfer of light energy to matter.
Transmission of Light The passing of light through an object.
Reflection of Light Light that bounces off an object.
Transparent Matter Matter that transmits all light, such as glass.
Translucent Matter Matter that transmits light, but scatters it, such as wax paper.
Opaque Matter Matter that does not transmit light, such as brick.
Colors of the visible light spectrum Red, orange, yellow, green, blue, indigo, violet.
Analog signals Signals sent as a continuous wave, such as land line phones.
Digital signals Signals sent as numbers, 0 and 1, such as cell phones.
Analog devices Clocks with hands, land line phones, record players.
Digital devices Cell phones, digital TV, computers.
Which signals are more reliable and pick up less noise? Digital.
Which property is the same for all electromagnetic waves? The same speed.
Created by: cook2sm
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