問題一覧
1
There are many _____ and many _____ sources of light
Natural, Artificial
2
Light from the sun is
Natural
3
Light from incandesence is
Artificial
4
The sun is the most _____ source of light
Abundant
5
______ atoms in the suns core have so much energy that they collide and sometimes _______ to form helium these reactions are called ________
Hydrogen, Combine(fuse), Fuse Reactions
6
Fuse reactions
Telease large atoms of energy
7
Incandescence Light
Light emitted from a material because of high temps of the material
8
Light from ____ is made up of many _____ mixed together. This type of light us called _____
Hot objects, Different colours , White light
9
Flourescence
Light that is emitted during exposure of the source to uv light
10
Flourescent Lighting is more ______ at producing light thatn _______ because it lasts longer
Efficient , Incandescent lighting
11
Luminescence
The emission of light by a material or object that has not been heated
12
Phosphoresence
These materials retain the energy for several minutes or hours eg. glow in the dark objects
13
Chemiluminescence
light that is produced by a chemical reaction without a rise in temp eg. glow light
14
Bioluminescence
light that us produced by a biochemical reaction in living organism eg. marine organism, living cell
15
an LED is an electroluminescent ligjt source made out of a material called ______
semi conductor
16
Light behaves like a special kind of wave called an _____
electromagnetic wave
17
Vacum
empty space
18
speed of light
3.00x10power of 8 m/s
19
Colours of the electromagnetic spectrum
ROYGBIV
20
What happens to light when it strikes an object
Absorbed, reflected, or transmitted
21
Reflection
The change in direction of a light ray when it bounces off a surface
22
Medium
The substance through which light travels
23
Ray
a straight line with an arrowhead that shows the direction which light waves are traveling
24
Law Of Reflection
The incident ray, the reflected ray, and the normal always lie on the same flat surface
25
Incident ray
a ray of light that travels from a light source toward a surface
26
angle of incidence
the angle between the incident ray and the normal in a ray diagram
27
normal
a line that is perpendicular to a surface where a ray of light meets the surface
28
reflected ray
a ray that begins at the point where the incident ray and normal meet
29
angle of reflection
the angle between the reflected ray and the normal ray in diagram
30
object
thing placed in front of a mirror
31
image
the likeness that is seen in the mirror
32
Plane mirror
a mirror with a flat, relective surface
33
four characteristics of an image
its location, orientation, size, type