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chp 21 &22
jamal
| Question | Answer |
|---|---|
| Radiation | the emission of energy in the form of EM waves is called |
| Particle | wave theory of light/ a particle with an electric charge |
| Electromagnetic Spectrum | the entire range of EM waves |
| Radio Waves | cover a wide range of waves in the EM spectrum |
| AM Radio | travel father than FM waves |
| FM Radio | more information can be carried in FM radio waves |
| Ionosphere | a region of Earth’s upper atmosphere |
| Microwaves | have shorter wavelengths and higher frequencies than radio waves |
| Radar | microwaves are also used for this |
| Infrared Waves | have shorter wavelengths and higher frequencies than microwaves |
| Visible Light | is the very narrow range of wavelengths and frequencies in the electromagnetic spectrum |
| Ultraviolet Light | is another type of electromagnetic waves produced by the sun |
| X | Rays |
| 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 the reflection |
| Regular Reflection | if the surface is smooth the light beams reflect off all points of the surface at the same angle |
| Diffuse reflection | if the surface is slightly rough ,like a wall, light beams will hit the surface and reflect at many different angles |
| Absorption | transfer of energy carried by light waves to particles of matter |
| Scattering | 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 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, and green |
| Pigment | is a material that gives a substance its color by absorbing some color of light and reflecting others |
| Primary Pigments | are yellow, cyan, and magenta |
| Prism | is a piece of glass that separates white light into the colors of visible light by refraction |
| Plane Mirror | is a mirror with a flat surface |
| Concave Mirror | mirrors that are curved inward, such as the inside of a spoon |
| Convex Mirror | the back of a spoon |
| Virtual Image | is an image through which light does not actually travel |
| Real Image | is an image through which light actually passes |
| Concave Lens | is thinner in the middle than at the edges |
| Convex Lens | is thicker in the middle than at the edges |
| Retina | the back surface of the eye |
| Nearsightedness | occurs when the eye is too long and the lens focuses light in front of the retina |
| Farsightedness | curs when the eye is too short and the lens focuses light behind the retina |
| Colorblindness | is when a person can only see black and white |
| Rods | one of the rod shaped cells in the retina of the eye of many vertebrate animals |
| Cones | a three dimensional surface or solid object in which the base is a circle and upper surface narrows to form a point |
| Laser | a device that creates and amplifies electromagnetic radiation of a specific frequency through the process of stimulated emissions |
| Hologram | a piece of film on which an interference pattern produces a three |
| Maiman | created the first laser |
| Dennis Gaber | invented hologram |
| Luminous | produce visible light |
| Illuminated | a visible object that is not a light source |
Created by:
likeab0ss
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