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8B science > Light > Flashcards

Light Flashcards

1
Q

Light is a source of________you can see

A

Energy

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2
Q

Light_______or________out in all directions.

A

Radiates

Spreads

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3
Q

Light is called____________. It does not require______to travel.

A

Radiant energy

Matter

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4
Q

The three different forms of energy are…

A

Thermal
Electrical
Chemical.

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5
Q

All objects that emit light are called…?

A

Luminous

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6
Q

3 natural sources of light are…?

A

Sun
Stars
Fire

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7
Q

2 artificial sources of light are…?

A

Candles

Light bulbs

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8
Q

Incandescent sources:

A

When an object is heated to such a high temperature that it emits light.

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9
Q

Incandescent sources:___________a lot of________,_____% of energy is______.

A

Wastes
Energy
95%
Heat

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10
Q

Fluorescent Sources:

A

High energy UV light is absorbed by particles causing them to emit visible light(A fluorescent light bulb)

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11
Q

Fluorescent Sources:

_________,_______,but_______efficient.

A

Expensive
Toxic
Energy

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12
Q

Fluorescent Sources:__________Energy>energy absorbed by_______particles>____light>energy absorbed by_______particles>_________light.

A

Electrical, mercury, UV, phosphor, visible.

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13
Q

Phosphorescent Sources:

A

Similar to fluorescent sources, but the phosphorescent particles take longer to emit the light and continue to glow after the energy source is removed.

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14
Q

Two examples of phosphorescent sources are…?

A

Alarm clocks

Glow in the dark toys.

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15
Q

Chemiluminescent Sources:

A

Light released from chemical reactions.

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16
Q

One example of chemiluminescent sources are…?

A

Glow sticks

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17
Q

Bioluminescent sources:

A

Results from chemical reactions in living creations.

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18
Q

3 examples of bioluminescent sources are…?(3)

A

Jellyfish
Fireflies
Fungus

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19
Q

Electricity is measured in_______()or___________().

A

Watts(W)

Kilowatts(kw)

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20
Q

What is the formula for calculating the cost of an electrical appliance?

A

Tc=kw•t•p

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21
Q

What are three types of material light can strike?

A

Opaque
Transparent
Translucent

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22
Q

Write three examples for each material.

A

Opaque-wood,rocks,people
Translucent-plastic, frosted glass, wax and tissue paper.
Transparent-Clear plast, clear glass, prism

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23
Q

The law of reflection:

A

The angle of reflection always equals the angle of incidence.

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24
Q

Reflection:

A

The process in which light strikes a surface and bounces back off that surface.

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25
If the surface is light:
Most of the light is reflected.
26
If the surface is dark:
Most of the light is absorbed.
27
Incident ray:
The ray that comes from the light source.
28
Reflected tay:
The ray that bounces off the object.
29
Normal line:
A line drawn perpendicular to the reflecting surface at the point where the incident ray strikes it.
30
Angle of Incidence:
The angle between the normal line and the incident ray.
31
Angle of reflection:
The angle between the normal line and the reflected ray.
32
Images in mirrors are known as_______.
Virtual images
33
The images in mirrors are also called______________.
Lateral image.
34
Convex:
Bulging out.
35
Concave:
Sinking in.
36
Two examples of convex mirrors are...?
Security mirrors | Vehicle side mirrors
37
Refraction is the____________of light when it travels from one material to another.
Bending
38
Speed________in more dense materials like glass and water, so it bends_______the normal.
Decreases | Towards
39
Speed_________in less dense materials like air, so it bends________the normal.
Increases | Away from
40
The difference between a mirror and a lens is that a mirror______and a lens__________.
Reflects | Refracts
41
A lens is a______piece of_________material.
Curved | Transparent
42
Double concave lens:A_________lens.
Diverging
43
Light passes through thicker areas more______than in thinner areas.
Slowly
44
Double concave lens are used in_________and_________.
Flashlights | Headlights
45
Double convex lens:A_______lens.
Converging
46
Four examples of a double concave lens are...?
Human eye Magnifying glass Telescopes Microscopes
47
Images form when rays______.
Converge
48
The lens in the human eye is________.
Convex
49
The human eye takes light from an object and through refraction, focuses them on the_______.
Retina
50
Sclera
Outside white part
51
Cornea
Thin layer on the surface of the eyeball.
52
Aqueous Humour
Water fluid between the cornea and iris.
53
Pupil
Dark center of the eye where light comes in
54
Iris
Colored ring of the eye, screens out light.
55
Optic nerve
When the cells in the retina detect light, impulses travel to the brain through the nerve.
56
Vitreous humour
Jelly like fluid behind the lens that helps the shape of the eye.
57
Retina
Light sensitive area at the back of the eye where images form.
58
Lens
Behind the pupil and iris(4mm)focuses the eye.
59
Ciliary muscle
Controls the shape of the lens
60
Normal vision
The lens focuses the image on your retina.
61
Ciliary muscles
Change the shape of your lens
62
The process of changing the lens shape is called...
Accommodation
63
Near point
Shortest distance at which an object is in focus
64
Adult
25cm
65
Baby
7cm
66
Far point
Longest distance at which an object is in focus.
67
A_______is a device that controls the aperture.
Diaphragm
68
In the human eye, the________is the diaphragm and the______is the aperture.
Iris | Pupil
69
Optic nerve
Takes in info from your retina to your brain
70
Blind spot
The point where the optic nerve enters the retina, there are no light sensing cells.
71
Near sightedness is also called...
Myopia
72
Near sightedness:
You cant see far away objects because you have long eyeballs.
73
Near sightedness can be corrected with a__________lens.
Concave
74
Far sightedness is also called...
Hyeropia
75
Far sightedness:
Cant see objects up close because you have short eyeballs.
76
Far sightedness can be corrected with a_________lens.
Convex
77
Astigmatism
Distorted vision caused by a defect in the curvature of the cornea.
78
Telescopes-
Help us see distant objects more clearly
79
Refracting telescopes
The objective lens forms the image and the eyepiece lens magnifies it.
80
Reflecting telescope
Objective mirror forms the image and the eyepiece magnifies it.
81
Binoculars
Two reflecting telescopes side by side.
82
Microscopes
Objective lens forms the image and the eyepiece lens magnifies the image further.
83
Light bends as it moves between materials due to a change in_______that is caused by different________.
Speed | Densitys
84
____________materials reflect or absorb all light that hit it.
Opaque
85
You can see an object clearly through__________materials
Transparent
86
Some light comes through_______material, but you cannot see an image clearly.
Translucent
87
Light is a form of______that travels in________lines.
Energy | Straight
88
The type of light energy that is stored by certain particles for a period of time is called...
Phosphorescent
89
The type of light that is produced when a material is heated is called...
Incandescent
90
A special type of light that is produced by living organisms is called...
Bioluminescent
91
A reversed image is called a...
Lateral image
92
Dark or rough images are...
Mon luminous
93
``` Which of the following is wrong about concave mirrors A)they are thicker around the edges B)they are used to change images C)They form real images D)they see larger areas ```
D
94
The light energy that is given off by fireworks come from...
Chemical energy
95
The ray of light that hits a surface is called the...
Incident ray
96
A 60 Watt light bulb and a 100 Watt light bulb differ in...
Intensity of light they produce
97
A pencil in a glass of water can look bent at the surface because of...
Refraction
98
What is the difference between reflection and refraction?
Reflection-light bounces off surface Refraction-light ray goes through surface and bends.
99
What evidence shows that light travels in straight lines?
Light doesn't bend, shadows.
100
State the similarities and differences between a real and virtual image.
Similarities-same size, appear to be the same, same color. Differences-virtual-reversed, virtual is only an image not an object.

8B science (11 decks)

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