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Beyond Our World

Comp 3 Light & Waves

TermDefinition
Astronomical Unit Measurement of distance for objects located in our immediate solar system
Light Year The distance light travels in 1 year. Used to measure distances in space outside our immediate solar system.
Waves Repeating movement or disturbance that carries energy through matter or space.
Wavelength Measure of one point on a wave to the same point on the next wave.
Frequency The number of waves that pass a fixed point in a given time.
Medium Matter or material through which a wave travels (solid, liquid, gas).
Electromagnetic Spectrum Waves of energy that come from the Sun as low energy radio waves to high energy gamma rays.
Radio Waves Longest wavelengths, lowest frequency, carries the least amount of energy. Used in radio transmission, cell phones & remote control cars.
Microwaves Invisible type of radiation that can cook food and is used in radar.
Infrared Invisible type of radiation that is used in thermal imaging & night vision goggles.
Visible Light The only part of the EM spectrum that the human eye can see.
Ultraviolet Type of light that cannot be seen and can cause burns and skin cancer.
X-rays Used for taking pictures of bones.
Gamma Rays Shortest wavelengths, highest frequency, carries the greatest amount of energy. Used in cancer treatments & equipment sterilization.
Reflection When a wave bounces off a surface.
Refraction The bending of waves as they change speed when they travel through different mediums.
Absorption The waves energy is retained without passing through a medium.
Sound Waves DO requires matter (a medium) to move energy.
Light Waves DO NOT require matter to transfer energy. Can move energy through space.
 



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