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chp 21 &22


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
Popular Physics sets




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