Physics(light) Flashcards
Amplitude
Is the wave height from the rest position to either the trough or the crest
~the smaller the amplitude the less energy carried and Vice versa
Frequency
- The rate of repetition
- The higher the frequency the more energy the wave passes along
- Measures in herts
The relationship between frequency and wave length
As frequency increases the wave length decreases
As frequency decreases the wave length increases
V=f x ¥
The
addictive colour theory
White light is made of different colours
The primary and secondary colours of light
In the ACT
P=red green and blue
S=cyan magenta and yellow
Subtractive colour theory
Black(coloured matter) is composed of different colours or wavelengths
Primary and secondary colours of light in the SCT
P=cyan magenta and yellow
S=red green blue
Bioluminescene
-ability of plant or animal to create light
-used to find prey or camouflage
(Jelly fish)
Incandescent light
-produced by an object that is at a very high temp
-there is a filament ( a piece of wire)
-when it’s hot the filaments releases light as a form of energy
GIVES OFF HEAT
Fluorescent light
Substances are exposed to electromagnetic radiation.
-filled with mercury vapour
-coated with phosphor (glows)
LIGHT AND HEAT
Phosphorescent
-emits light only while being exposed to ultraviolet radiation
-stores energy then slowly releases
GLOW IN THE DARK
Chemiluminescence
Produced by a chemical reaction with NO TEMP RISE
-glows when it reacts with iron
(glow sticks)
Triboluminescent
Produced heat with friction
Crushing crystals or rubbing
Electric discharge
Produced light when an electric current passes through the air or another gas
(Lightening)
LEDs
Light emitting display
(Electroluminescent)
A light emitting dioide is am electroluminescent light source made of a semiconductor
