light (refection) Flashcards
what are the 5 properties of light
- light does not need a medium to travel through
- we see thing because they reflect light into our eyes
3, light travels faster than sound - shadows for when light is blocked
- light travels in a straight line
how is light transferred
by radiation
product of light Incandescence
- product of light of very high temperatures
ex. incandescent light-bulbs, burning candle.
production of light by electric discharge
- producing light by passing electric currents through gas
ex: lighting, neon light
production of light by phosphorescence
- producing light by the absorption of UV lights resulting in the emission of visible light over a long time.
ex: glow-in-the-dark stickers, dials on watches
production of light of fluorescence
immediate emission of visible light as a result of absorption of UV Light
ex: highlighters, detergents
the production of chemiluminescence
direct production of light as a result of chemical reaction with little or no heat produced
ex: light sticks glow sticks
production of light by Bioluminescence
the production of light in living organisms as a result of chemical reactions
ex. fireflies, glow worms
production of light by triboluminescence
production of light from friction (scratching or crushing)
ex. scratching quartz, crushing sugar
Production of light from LED
Light emitted diode
allows current to move in one direction
(rely on a material called Semiconductors)
ex. X-mas light, street lights
electromagnetic waves in order from lowest energy to highest
Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma-ray
incident ray
the incoming ray that stricks the surface
Normal
the perpendicular line to the mirror surface
perpendicular
at a right angle
Spectacular refection
a series of parallel incident ras strike a flat effective surface
- incident angles are identical
