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