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Science 8 > Science- Waves > Flashcards

Science- Waves Flashcards

1
Q

Energy

A

Capacity to apply a force over a distance

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2
Q

Force

A

A push/ pull on an object

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3
Q

Another name for rest position?

A

Equilibrium

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4
Q

Rest position

A

Level of the water when there are no waves

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5
Q

Crest

A

Highest point in a wave

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6
Q

Trough

A

Lowest point in a wave

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7
Q

Wavelength

A

The distance from crest to crest, trough to trough, one complete crest and one complete trough

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8
Q

Wavelength measured in?

A

Metres

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9
Q

Amplitude

A

Height of a wave crest or depth of a wave trough as measured from its rest position

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10
Q

Every cycle of bobbing up and down is called?

A

Oscillation or vibration

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11
Q

Frequency

A

Number of repetitive motions that occur in a given time

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12
Q

Frequency is measured in?

A

Hertz or cycles per sec

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13
Q

When one value increases as the other decreases, it’s called?

A

Inverse relationship

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14
Q

Medium

A

The matter the waves travel through

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15
Q

Transverse waves

A

Matter in medium move up and down perpendicular to direction wave travels

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16
Q

Compression waves

A

Matter in medium moves back and forth along the same direction that wave travels

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17
Q

Wave

A

Disturbance/ movement that transfers energy through matter or space without causing any permanent displacement

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18
Q

Frequency formula

A

f= # of cycles/ sec

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19
Q

Period formula

A

T= sec/ # of cycles

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20
Q

Model

A

Way of presenting something in order to understand it better and to make predictions

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21
Q

Wave model of light

A

Explanation of light behaviour -Pictures light travelling as a wave

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22
Q

Light

A

Type of wave that travels though empty space and transfers energy from one place to another

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23
Q

Visible light

A

Wave that you can see

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24
Q

Refraction

A

The bending or changing direction of a wave as it passes from one material to another

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25
Q

Visible spectrum

A

The range of colours or frequencies of visible light

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26
Q

ROY G BIV

A

Red orange yellow green blue indigo violet

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27
Q

Colour with longest wavelength?

A

Red

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28
Q

Colour with shortest wavelength?

A

Violet

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29
Q

Is colour a property of visible light?

A

Yes.

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30
Q

White light

A

Result of mixing together all different colours of light

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31
Q

2 prism can do what?

A

Recombine the colours to form white light again

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32
Q

Reflection

A

Occurs when a light wave strikes an object and bounces off.

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33
Q

Reflected colours and absorbed colours

A

Reflected: can see
Absorbed: can’t see

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34
Q

What colours are needed to produce all the colours of the rainbow?

A

Red green blue

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35
Q

Additive primary colours

A

Red green blue

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36
Q

Secondary colour

A

2 additive colours combined

Yellow cyan magenta

37
Q

Light is both?

A

Wave and particle

Particle called photons

38
Q

Most important source of light on earth?

39
Q

Where does the light go from the sun and other stars?

A

Spreads out(radiates) all directions

40
Q

Radiant energy

A

Energy that travels by radiation

41
Q

Sun also radiates?

A

Invisible energy

42
Q

Light is classified as ?

A

Electromagnetic radiation

43
Q

Electromagnetic spectrum

A

Represents different forms of electromagnetic radiation. -Visible light and all invisible forms of radiant energy

44
Q

Electromagnetic radiation

A

Transmission of energy in the form of waves that extend from the longest radio waves to the shortest gamma rays

45
Q

Radio waves

A

Type of electromagnetic radiation that have the longest wavelength and lowest energy and frequency compared to all other types

46
Q

Microwaves and radar are a type of ?

A

Radio waves

47
Q

Microwaves

A

Shortest wavelength and highest frequency of all radio waves

48
Q

Radar

A

Remote sensing (shorter wavelength microwaves)

49
Q

Radar is used for?

A

Tracking movement of automobiles, aircraft, watercraft, and spacecraft

50
Q

Radar also used for?

A

Weather forecasting

51
Q

Infrared waves

A

Type of electromagnetic radiation that has longer wavelength and lower energy and frequency

52
Q

Infrared radiation is also called?

A

Heat radiation

53
Q

Every object emits what?

A

Infrared waves bc all objects contain some heat source

54
Q

Ultraviolet waves

A

Type of electromagnetic radiation that has a shorter wavelength and higher energy and frequency

55
Q

Uv radiation helps your body?

A

Make vitamin D

56
Q

Overexposure of Uv radiation can cause

A

Sunburns skin cancers damage to surface of the eye

57
Q

Fluorescent materials

A

Absorbs uv waves and emit the energy as visible light

58
Q

Another property of uv waves

A

Kill bacteria in food water and medical supplies

59
Q

X rays

A

Type of electromagnetic radiation that have a much shorter wavelength and higher energy and frequency than uv waves

60
Q

Who discovered x rays

A

Wilhelm roentgen
German physicist
1895

61
Q

Gamma rays

A

Highest energy and frequency and shortest wavelength portion of the electromagnetic spectrum

62
Q

Gamma rays result from and produced?

A

Nuclear reactions

Produced by hottest regions if universe

63
Q

Gamma rays

A

Used in radiation therapy to kill cancer cells

64
Q

Most important source of light on earth?

65
Q

Where does the light go from the sun and other stars?

A

Spreads out(radiates) all directions

66
Q

Radiant energy

A

Energy that travels by radiation

67
Q

Sun also radiates?

A

Invisible energy

68
Q

Light is classified as ?

A

Electromagnetic radiation

69
Q

Electromagnetic spectrum

A

Represents different forms of electromagnetic radiation. -Visible light and all invisible forms of radiant energy

70
Q

Electromagnetic radiation

A

Transmission of energy in the form of waves that extend from the longest radio waves to the shortest gamma rays

71
Q

Radio waves

A

Type of electromagnetic radiation that have the longest wavelength and lowest energy and frequency compared to all other types

72
Q

Microwaves and radar are a type of ?

A

Radio waves

73
Q

Microwaves

A

Shortest wavelength and highest frequency of all radio waves

74
Q

Radar

A

Remote sensing (shorter wavelength microwaves)

75
Q

Radar is used for?

A

Tracking movement of automobiles, aircraft, watercraft, and spacecraft

76
Q

Radar also used for?

A

Weather forecasting

77
Q

Infrared waves

A

Type of electromagnetic radiation that has longer wavelength and lower energy and frequency

78
Q

Infrared radiation is also called?

A

Heat radiation

79
Q

Every object emits what?

A

Infrared waves bc all objects contain some heat source

80
Q

Ultraviolet waves

A

Type of electromagnetic radiation that has a shorter wavelength and higher energy and frequency

81
Q

Uv radiation helps your body?

A

Make vitamin D

82
Q

Overexposure of Uv radiation can cause

A

Sunburns skin cancers damage to surface of the eye

83
Q

Fluorescent materials

A

Absorbs uv waves and emit the energy as visible light

84
Q

Another property of uv waves

A

Kill bacteria in food water and medical supplies

85
Q

X rays

A

Type of electromagnetic radiation that have a much shorter wavelength and higher energy and frequency than uv waves

86
Q

Who discovered x rays

A

Wilhelm roentgen
German physicist
1895

87
Q

Gamma rays

A

Highest energy and frequency and shortest wavelength portion of the electromagnetic spectrum

88
Q

Gamma rays result from and produced?

A

Nuclear reactions

Produced by hottest regions if universe

89
Q

Gamma rays

A

Used in radiation therapy to kill cancer cells

Science 8 (9 decks)

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