9th Science Ch. 14
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| stiulated emission | the process that occurs when an exited atom is stuck by one photon and emists two photons
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| violet | color of visible light with the highest frequency
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| Max Planck | German scientist who showed tht the energy of an electromgnetic wave is irectly related to the wave's freuency
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| microwaves | waves commonly used for radar, satellite communications, and heating food items
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| radar | a device that uss reflected electromagnetic waves to measure the istance and direction of faraway objects
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| time dilaton | the apparent slowing down of time (from the perspective of an outside observer) for an object traveling at newr-light speed
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| refraction | the bending of light rays when they cross a boundary between two mediums
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| fiber optics | the technique of transmitting light through narrow glasslike "wires" used for communications
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| 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
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| red | the color of visible light with the lowest frequency
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| visible spectrum | red, orange, yellow, green, blue, violet
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| electromagnetic spectrum | an arrangement of all forms of electromagnetic radioation in order of frequency and wavelength
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| Theodore H. Maiman | American scientist who constructed the first laser
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| radio waves | low-frequency waves widely used for communicaton
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| hologra | a three dimensional image produced by laser light
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| cherent | light in which all the waves are "in step"
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| particles | light acts like _____ when interacting with matter
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| X-rays | high frequency electromagnetic aves used in meicine, dentistry, andin airport security to "see" inside solid objects
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| white | a combination of all the colors of light mixed together is perceived as this
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| Wihelm Roentgen | German scientist who discovered X-rays
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| C | the speed of light in a vacuum
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| photons | light is descrimed as consisting of tiny bundles or "packest" of energy. these travel as the electromagnetic waves
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| particles theory of light | states that light canbe pictured as streams of tiny particles emitted by light sources
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| reflection | the boncing of light rays off a surface so that they continue in a different direction
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| coherent, intence, monochromatic | properties of laser light
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| James Clerk Maxwell | Scottish scientist ho discovered that light consists of electromagnetic waves
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| rainbow | visible spectrum produced in the sky by falling randrops
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| laser | light amplification by stimulated emission of rdiation
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| red, green, blue | the thre additve primary colors of light
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| UVB | the type of ultraviolet radiation that causes suntas and sunburn
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| Heirich Hertz | Germa scientist who first studied radio waves in the laboratory
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| 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
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| diffraction | the spreading out of light waves aa result of passing though a narrow gap
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| nanometer | one billionth of a meter
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| black | the absence of all colors flight is perceived as this
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| lens | a piece of glass or other substance secifically designed to refract light
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| quantum thory of light | state that light has characteristics of both particles and waves
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| ultraviolet rays | electromagnetic waves responsible for tanning and subnburn
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| monochromatic | light that consists of only one frequency
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| Aristotle | Greek philosopher who taught that pure white lit contains no color
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| polarized | a beam of light containing wae that all vibrate in the same direction
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| mirage | an example is an illusion of "water" covering a hot highway i the distane in the summer
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| Christian Huyges | Dutch scientist who first proposed the wave theory of light
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| cyan, magenta, and yellow | the hree subtractive primary colors of piment
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| convex | a lens that is thickeer in the middle than at the edges, causes light rays to be concentrated and obectto appear magnified
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| infrared waves | electromagnetic wavs sometimes referred to as "heat waves"
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| Albert Einstein | Jewish scientist who redited stimulated emission and fomulated the theory of relativity
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| interference | the mtual reinforcement or cancellation of two light waves
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| Gamma rays | the most powerful and penetrating form of electromagnetic radiation
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| 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
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| visible lig | electromagneticwaves tht our eyes can perceive
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| concave | a lens that is thinner in the middle than at the edges, causing light rays to be spreadout and objects to appear smaller
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| 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
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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