Physics Test #1
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The electromagnetic Spectrum
-Radio -longest wave length -Microwave -Infread -Visible -Ultraviolet -X-ray -Gamma ray- shortest wave length but highest frequency
what is incandescence
when light is produced from heat -Waste a-lot of energy example: fire
what is electric discharge
When you run electricity through a noble gas it produces light -Neon signs (opening signs)
what is phosphorescence
The production of light by absorbing ultraviolet light and slowing emitting it as visible light -glow in the dark
what is fluorescence
The production of light by absorbing ultraviolet light and immediately emitting it as visible light -highlighter
what is chemiluminescence
Production of light through a chemical reaction -glow sticks
what is bioluminescence
Chemiluminescence but inside a living organism -Fire fly
what is triboluminescence
production of light by rubbing certain crystals together -life savers
What is light emitting diode
the production of light as a result if passing on electric current through a semiconductor -LED light
what is a laser
producing light and focusing to a narrow point using many mirrors -Laser
radio waves uses
-Tv signals -cellphone communication -AM/FM radio
microwaves uses
-microwave ovens -telecommunications
infared light uses
-remote controls -keep food warm
visible light uses
-rainbows -human vision
ultraviolet uses
-causes skin to tan and burn -increases skin cancer
x-rays uses
-medical imaging -cancer treatment
gamma rays uses
-cancer treatment
are most object luminous or non-luminous
non-luminous
what is the speed of light
3.0x 108 mls