Light Flashcards
What is light?
Light is a wave
It is a particle
It has no mass
It can travel at 300 000 000m/s
Wave properties of light
An electromagnetic wave
Has wave lengths and frequencies
Light wave size largest to smallest
Radio waves Microwave Infrared Visible light (low strength-ROYGBIV high strength) Ultraviolet (UV) X-Rays Gamma
Sources of light
Incandescence Fluorescence LED Chemiluminescence Bioluminescence Electric discharge Phosphorescence Triboluminescence
Luminescent
An object that produces and emits light is luminous
Incandescence
Light produced when an object is heated to a hot temperature
Fluorescence
An object can absorb UV light and re-emit visible light
LED
Use current to produce light; are efficient
What does LED stand for?
Light emitting diodes
Chemiluminescence
A chemical reaction produces light
Bioluminescence
Chemiluminescence in a living organism
Ex. Firefly
Non luminous
Does not produce its own light
Electric discharge
The process of producing light by passing an electric current through a gas
Phosphorescence
The process of producing light by the absorption of UV light resulting in the emission of visible light over an extended period of time
Triboluminescence
The production of light from friction as a result of scratching, crushing, or rubbing certain crystals
