click below
click below
Normal Size Small Size show me how
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 |