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ch.21 terms
| Question | Answer |
|---|---|
| Radiation | the emission of energy in the form of EM waves. |
| Particle | wave theory of light |
| Electromagnetic Spectrum | The entire range of EM waves. |
| Radio Waves | Cover wide range of waves in the EM spectrum. |
| AM Radio Waves | can reflect off the ionosphere allowing longer distances. |
| FM Radio | Pass through the ionosphere, therefore FM waves cannot travel as far as AM waves. |
| Ionosphere | a layer of the atmosphere |
| Microwaves | shorter wavelengths and higher frequencies than radio waves. |
| Radar radio | detection and ranging, produces waves that bounce off objects giving its speed and location. |
| Infrared Waves | shorter wave lengths and higher frequencies than microwaves. |
| Visible Light | the very narrow range of wavelengths and frequencies. |
| Ultraviolet Light | another type of electromagnetic wave produced by the sun. |
| X-Rays | carry a great deal of energy and easily penetrate a variety of materials. |
| Gamma Rays | carry large amounts of energy and can penetrate materials very easily. |
| Law of Reflection | states that the angle of incidence is equal to the angle of reflection. |
| Regular Reflection light beams | reflect off all points of the surface at the same angle. |
| Diffuse reflection beams | hit the surface and reflect in many different 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 been absorbed energy. |
| Transmission | The passing of light through matter. |
| Transparent | matter through which visible light is easily transmitted. |
| Opaque | matter that does not transmit any light. |
| Translucent matter | transmits light but also scatters the light as it passes through the matter. |
| Primary Colors of Light | Red Blue Green |
| Pigment | a material that gives a substance its color by absorbing some colors of light and reflecting others. |
| Primary Pigments | Yellow, Cyan, Magenta |
| Prism | a transparent optical element with flat, polished surfaces that refract light. |
| Plane Mirror | a mirror with a flat surface. |
| Concave Mirror | mirrors that are curved inward. |
| Convex Mirror | a mirror that curved outward toward you. |
| Virtual Image | images created by a convex mirror. |
| Real Image | an image through which light actually passes. |
| Concave Lens | thinner in the middle than at the edges. |
| Convex Lens | thicker in the middle that at the edges. |
| Retina | the back surface of the eye. |
| Nearsightedness | occurs when the eye is too long and the lense focuses light in front of the retina. |
| Farsightedness | occurs when the eye is too short and the lens focuses light behind the retina. |
| Colorblindness | when someone can see no colors or cannot distinguish shades of red and green or red from green |
| Rods | responsible for vision at low visible light. |
| Cones | responsible for seeing high level light. |
| 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 dimensional image of an object. |
| Maiman | created the first laser |
| Dennis Gaber | invented hologram |
| Luminous | objects that produce light. |
| Illuminated | a visible object that is not a light source. |
Created by:
ibriana97
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