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chapter 23 & 24 term
light unit terms
| Question | Answer |
|---|---|
| Radiation | the transfer of energy through matter or space as electromagnetic waves, such as visible light and infrared waves |
| Particle | wave theory of light |
| Electromagnetic Spectrum – | the entire range of EM waves |
| Radio Waves | long wavelengths and low frequencies that cover a large range of the EM spectrum |
| AM Radio | reflect of the ionosphere making it possible to travel larger distances |
| FM Radio | pass through the ionosphere causing the distance traveled smaller |
| Ionosphere | a layer in the atmosphere |
| Microwaves | short wavelengths high frequency |
| Radar | (RAdio Detection And Ranging) detects speed and location |
| Infrared Waves | short wavelength and high frequency that carries more energy |
| Visible Light | the narrow range of the spectrum where humans see the different wavelengths as colors |
| Ultraviolet Light | short wavelength and high frequency produced by the sun |
| X Rays | carry a lot of energy and has the shortest wavelengths and highest frequency in the spectrum |
| Gamma Rays | large amounts of energy and is exposed to people ever day |
| Law of Reflection | states that the angle of incidence is equal to the angle of reflection |
| Regular Reflection | when light beams are reflected at the same angle |
| Diffuse reflection | when light beams reflect at several angles |
| Absorption | the transfer of energy carried by light waves to particles of matter |
| Scattering | the release of light energy by particles of matter that have absorbed energy |
| Transmission | the passing of light through matter |
| Transparent | matter through which visible light is easily seen through it |
| Opaque | matter that does not transmit any light |
| Translucent | matter that transmits light but also scatters the light as it passes through the matter |
| Primary Colors of Light | red, blue, green |
| Pigment | material that gives a substance its color by absorbing some colors of light and reflecting others |
| Primary Pigments | yellow, cyan, magenta |
| Prism | this is a transparent solid body, often having triangular bases, used for dispersing light into a spectrum or for reflecting rays of light. |
| Plane Mirror | a mirror with a flat surface |
| Concave Mirror | mirrors that are caved inward, like the face of a spoon |
| Convex Mirror | a mirrors that curves outward to you, like the back of a spoon |
| Virtual Image | an image through which light does not travel |
| Real Image | an image through which light actually passes |
| Concave Lens | thicker in the middle than the edges |
| Convex Lens | thinner in the middle than the edges |
| Retina | this is the back part of the eye. The light forming the real image is detected by receptors in the area is called cones and rods |
| Nearsightedness | can see objects clearly, only if the objects are close nearby |
| Farsightedness | can see objects that are far away, but objects nearby look a little blurry |
| Colorblindness | a deficiency in which a person can only see black and white |
| Rods | takes some of the intense light away |
| Cones | help you see color |
| Laser | a device that produces intense light of only one color and wavelength |
| Hologram | a piece of film on which an interference pattern produces a three |
| Maiman – | created the very first laser |
| Dennis Gaber – | invented the hologram |
| Luminous – p. 594 – | Objects that produce visual light |
| Illuminated – p.594 – | Objects that are not a light source |
Created by:
megandonoho
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