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9th Science Ch. 14

stiulated emission the process that occurs when an exited atom is stuck by one photon and emists two photons
violet color of visible light with the highest frequency
Max Planck German scientist who showed tht the energy of an electromgnetic wave is irectly related to the wave's freuency
microwaves waves commonly used for radar, satellite communications, and heating food items
radar a device that uss reflected electromagnetic waves to measure the istance and direction of faraway objects
time dilaton the apparent slowing down of time (from the perspective of an outside observer) for an object traveling at newr-light speed
refraction the bending of light rays when they cross a boundary between two mediums
fiber optics the technique of transmitting light through narrow glasslike "wires" used for communications
theory of relativity states that all motion is relative to some reference point and that the speed of light is constant in relation to an observer
red the color of visible light with the lowest frequency
visible spectrum red, orange, yellow, green, blue, violet
electromagnetic spectrum an arrangement of all forms of electromagnetic radioation in order of frequency and wavelength
Theodore H. Maiman American scientist who constructed the first laser
radio waves low-frequency waves widely used for communicaton
hologra a three dimensional image produced by laser light
cherent light in which all the waves are "in step"
particles light acts like _____ when interacting with matter
X-rays high frequency electromagnetic aves used in meicine, dentistry, andin airport security to "see" inside solid objects
white a combination of all the colors of light mixed together is perceived as this
Wihelm Roentgen German scientist who discovered X-rays
C the speed of light in a vacuum
photons light is descrimed as consisting of tiny bundles or "packest" of energy. these travel as the electromagnetic waves
particles theory of light states that light canbe pictured as streams of tiny particles emitted by light sources
reflection the boncing of light rays off a surface so that they continue in a different direction
coherent, intence, monochromatic properties of laser light
James Clerk Maxwell Scottish scientist ho discovered that light consists of electromagnetic waves
rainbow visible spectrum produced in the sky by falling randrops
laser light amplification by stimulated emission of rdiation
red, green, blue the thre additve primary colors of light
UVB the type of ultraviolet radiation that causes suntas and sunburn
Heirich Hertz Germa scientist who first studied radio waves in the laboratory
iridescence an array of many colors caused by the nterference of light waves often seen on the surface of soap bubbles and thin films of oil
diffraction the spreading out of light waves aa result of passing though a narrow gap
nanometer one billionth of a meter
black the absence of all colors flight is perceived as this
lens a piece of glass or other substance secifically designed to refract light
quantum thory of light state that light has characteristics of both particles and waves
ultraviolet rays electromagnetic waves responsible for tanning and subnburn
monochromatic light that consists of only one frequency
Aristotle Greek philosopher who taught that pure white lit contains no color
polarized a beam of light containing wae that all vibrate in the same direction
mirage an example is an illusion of "water" covering a hot highway i the distane in the summer
Christian Huyges Dutch scientist who first proposed the wave theory of light
cyan, magenta, and yellow the hree subtractive primary colors of piment
convex a lens that is thickeer in the middle than at the edges, causes light rays to be concentrated and obectto appear magnified
infrared waves electromagnetic wavs sometimes referred to as "heat waves"
Albert Einstein Jewish scientist who redited stimulated emission and fomulated the theory of relativity
interference the mtual reinforcement or cancellation of two light waves
Gamma rays the most powerful and penetrating form of electromagnetic radiation
Isaac Newton English scientist who discovered that white light is a combination of various other colors and frequencies of light; proposed the particles theory of light in his book Optiks
visible lig electromagneticwaves tht our eyes can perceive
concave a lens that is thinner in the middle than at the edges, causing light rays to be spreadout and objects to appear smaller
approximatly 300,000 kilometers per second or 300,000 km/s: the speed of light is always constant: it is the fastest possibl speed in the universe facts about the speed of light in a vacuum
Created by: kbtarheelgirl

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