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8B science > Light > Flashcards

Light Flashcards

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Biology 101 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
Q

If the surface is light:

A

Most of the light is reflected.

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26
Q

If the surface is dark:

A

Most of the light is absorbed.

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27
Q

Incident ray:

A

The ray that comes from the light source.

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28
Q

Reflected tay:

A

The ray that bounces off the object.

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29
Q

Normal line:

A

A line drawn perpendicular to the reflecting surface at the point where the incident ray strikes it.

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30
Q

Angle of Incidence:

A

The angle between the normal line and the incident ray.

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31
Q

Angle of reflection:

A

The angle between the normal line and the reflected ray.

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32
Q

Images in mirrors are known as_______.

A

Virtual images

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33
Q

The images in mirrors are also called______________.

A

Lateral image.

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34
Q

Convex:

A

Bulging out.

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35
Q

Concave:

A

Sinking in.

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36
Q

Two examples of convex mirrors are…?

A

Security mirrors

Vehicle side mirrors

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37
Q

Refraction is the____________of light when it travels from one material to another.

A

Bending

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38
Q

Speed________in more dense materials like glass and water, so it bends_______the normal.

A

Decreases

Towards

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39
Q

Speed_________in less dense materials like air, so it bends________the normal.

A

Increases

Away from

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40
Q

The difference between a mirror and a lens is that a mirror______and a lens__________.

A

Reflects

Refracts

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41
Q

A lens is a______piece of_________material.

A

Curved

Transparent

42
Q

Double concave lens:A_________lens.

A

Diverging

43
Q

Light passes through thicker areas more______than in thinner areas.

A

Slowly

44
Q

Double concave lens are used in_________and_________.

A

Flashlights

Headlights

45
Q

Double convex lens:A_______lens.

A

Converging

46
Q

Four examples of a double concave lens are…?

A

Human eye
Magnifying glass
Telescopes
Microscopes

47
Q

Images form when rays______.

A

Converge

48
Q

The lens in the human eye is________.

A

Convex

49
Q

The human eye takes light from an object and through refraction, focuses them on the_______.

A

Retina

50
Q

Sclera

A

Outside white part

51
Q

Cornea

A

Thin layer on the surface of the eyeball.

52
Q

Aqueous Humour

A

Water fluid between the cornea and iris.

53
Q

Pupil

A

Dark center of the eye where light comes in

54
Q

Iris

A

Colored ring of the eye, screens out light.

55
Q

Optic nerve

A

When the cells in the retina detect light, impulses travel to the brain through the nerve.

56
Q

Vitreous humour

A

Jelly like fluid behind the lens that helps the shape of the eye.

57
Q

Retina

A

Light sensitive area at the back of the eye where images form.

58
Q

Lens

A

Behind the pupil and iris(4mm)focuses the eye.

59
Q

Ciliary muscle

A

Controls the shape of the lens

60
Q

Normal vision

A

The lens focuses the image on your retina.

61
Q

Ciliary muscles

A

Change the shape of your lens

62
Q

The process of changing the lens shape is called…

A

Accommodation

63
Q

Near point

A

Shortest distance at which an object is in focus

64
Q

Adult

A

25cm

65
Q

Baby

A

7cm

66
Q

Far point

A

Longest distance at which an object is in focus.

67
Q

A_______is a device that controls the aperture.

A

Diaphragm

68
Q

In the human eye, the________is the diaphragm and the______is the aperture.

A

Iris

Pupil

69
Q

Optic nerve

A

Takes in info from your retina to your brain

70
Q

Blind spot

A

The point where the optic nerve enters the retina, there are no light sensing cells.

71
Q

Near sightedness is also called…

A

Myopia

72
Q

Near sightedness:

A

You cant see far away objects because you have long eyeballs.

73
Q

Near sightedness can be corrected with a__________lens.

A

Concave

74
Q

Far sightedness is also called…

A

Hyeropia

75
Q

Far sightedness:

A

Cant see objects up close because you have short eyeballs.

76
Q

Far sightedness can be corrected with a_________lens.

A

Convex

77
Q

Astigmatism

A

Distorted vision caused by a defect in the curvature of the cornea.

78
Q

Telescopes-

A

Help us see distant objects more clearly

79
Q

Refracting telescopes

A

The objective lens forms the image and the eyepiece lens magnifies it.

80
Q

Reflecting telescope

A

Objective mirror forms the image and the eyepiece magnifies it.

81
Q

Binoculars

A

Two reflecting telescopes side by side.

82
Q

Microscopes

A

Objective lens forms the image and the eyepiece lens magnifies the image further.

83
Q

Light bends as it moves between materials due to a change in_______that is caused by different________.

A

Speed

Densitys

84
Q

____________materials reflect or absorb all light that hit it.

A

Opaque

85
Q

You can see an object clearly through__________materials

A

Transparent

86
Q

Some light comes through_______material, but you cannot see an image clearly.

A

Translucent

87
Q

Light is a form of______that travels in________lines.

A

Energy

Straight

88
Q

The type of light energy that is stored by certain particles for a period of time is called…

A

Phosphorescent

89
Q

The type of light that is produced when a material is heated is called…

A

Incandescent

90
Q

A special type of light that is produced by living organisms is called…

A

Bioluminescent

91
Q

A reversed image is called a…

A

Lateral image

92
Q

Dark or rough images are…

A

Mon luminous

93
Q 
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
A

D

94
Q

The light energy that is given off by fireworks come from…

A

Chemical energy

95
Q

The ray of light that hits a surface is called the…

A

Incident ray

96
Q

A 60 Watt light bulb and a 100 Watt light bulb differ in…

A

Intensity of light they produce

97
Q

A pencil in a glass of water can look bent at the surface because of…

A

Refraction

98
Q

What is the difference between reflection and refraction?

A

Reflection-light bounces off surface

Refraction-light ray goes through surface and bends.

99
Q

What evidence shows that light travels in straight lines?

A

Light doesn’t bend, shadows.

100
Q

State the similarities and differences between a real and virtual image.

A

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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