Physics(light) Flashcards Preview

science Grade 10 > Physics(light) > Flashcards

Flashcards in Physics(light) Deck (23):
1

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

2

Frequency

-The rate of repetition
-The higher the frequency the more energy the wave passes along
-Measures in herts

3

The relationship between frequency and wave length

As frequency increases the wave length decreases
As frequency decreases the wave length increases

V=f x ¥

4

The
addictive colour theory

White light is made of different colours

5

The primary and secondary colours of light
In the ACT

P=red green and blue
S=cyan magenta and yellow

6

Subtractive colour theory

Black(coloured matter) is composed of different colours or wavelengths

7

Primary and secondary colours of light in the SCT

P=cyan magenta and yellow
S=red green blue

8

Bioluminescene

-ability of plant or animal to create light
-used to find prey or camouflage
(Jelly fish)

9

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

10

Fluorescent light

Substances are exposed to electromagnetic radiation.
-filled with mercury vapour
-coated with phosphor (glows)
LIGHT AND HEAT

11

Phosphorescent

-emits light only while being exposed to ultraviolet radiation
-stores energy then slowly releases
GLOW IN THE DARK

12

Chemiluminescence

Produced by a chemical reaction with NO TEMP RISE
-glows when it reacts with iron
(glow sticks)

13

Triboluminescent

Produced heat with friction
(Crushing crystals or rubbing)

14

Electric discharge

Produced light when an electric current passes through the air or another gas
(Lightening)

15

LEDs

Light emitting display
(Electroluminescent)
A light emitting dioide is am electroluminescent light source made of a semiconductor

16

When does a shadow occur

When an opaque object blocks a direct light from the light source

17

A small light casts shadows that are...

Sharp and well defined

18

A large light source casts a shadow that is..

Not sharp because the object only partly blocks the light

19

Umbra

Part of the shadow where the light is blocked

20

OLEDs

Organic light emitting display
Organic molecules use electric current to produce light
Easily damaged by water

21

LCD

Liquid crystal display
A white light shines behind a liquid crystal

22

Plasma displays

Brighter than LCD but more energy
Ultraviolet radiation is absorbed by phosphors that radiate light

23

Wave length

~From either one trough to the next or one creat to the next
~measured in meters