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Beyond Our World
Comp 3 Light & Waves
Term | Definition |
---|---|
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. |