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Light

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hasanahatesscience's version from 2015-12-17 03:23

Section 1

Question Answer
light is made up ofphotons that travel in waves
light provides energy for plants to perform photosynthesis
non luminousobjects that can be seen bc light reflects from or passes through them. MIRRORS BOOKS MOOn
luminousobjects that produce light that can come from a natural or artificial source. SUN NORTHERN LIGHTS LIGHT BULBS NEON SIGNS
light is produced whenanother form of energy is converted to light energy
some objects give off light becausethey are hot (incandescense)
incandescence, electrical current runs through tinymetal filament making it so hot it glows
luminescencelight produced without objects becoming hot
chemluminescencelight given off during chemical reactions (glow sticks)
bioluminescencechemiluminescenc e in living organisms (firefly)
tripoluminescencelight is generated when crystals are pulled apart scratched crushed or rubbed
electric dischargehigh energy electrons are released within glass tube and COLLIDE w gas particles n energy is transferred to the gas wHICH RELEASES ENERGY AS LIGHT
fluorescencetype of electric discharge where inner tube is COVERED WITH PHOSPHOR. UV LIGHT TRANSFERS ENERGY TO PHOSPER THAT RELEASES ENERGY AS LIGHT
light emitting diode (LEDuse an electronic light source n allow electric current to flow in only one direction. does not require a filament
phospherescencevisible light is emitted over a period of time
fluorescence visiblelight is emitted immediately
electric discharge produceslight by passing an elec current through a gas
memorize

Section 2

Question Answer
light travels in a straight linewhen it is travelling through a uniform medium
light can reflect when it strikes a reflective surfaceor bend (REFRACT) when it travels from one medium to another
a ray is represented by a single unitof light and is drawn as a single straight arrow
a beam of light contains many rays of light moving in the same direction
some materials let lightpass through
some materials absorb the lightand other materials reflect the light
materials can be classifedaccording to how they transmit, absorb and reflect light
what is a transparent mediumallows light to pass through it, easy to see objects through transparent medium (GLASS AIR WATER PLASTIC WRAP)
what is a translucent mediummaterials transmit some light that strikes it but REFLECTS or ABSORBS THE REST. Translucent objects are only partially see through (FROSTED GLASS AND WAX PAPER)
opaquemade up of materials that do not allow any light to pass through them (bricks, wood)
memorize

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