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Flashcards in Wave Light Sound Deck (86):
1

Medium

The material that gets disturbed/ moved

2

What are the two types of waves

Transversals
Longitudinal

3

Transversal

Medium motion perpendicular to the direction of wave( energy traveled )
|
--

4

Longitudinal

Motion of medium is parallel to wave direction, medium bunches up into compressions and spreads out into rarefactions

5

Rare fraction

The part if longitudinal wave not compressed

6

Compression

The part of longitudinal wave that's compressed

7

Amplitude

Max distance molecules displaced from rest position, hieght of wave

8

How is energy and amplitude related

More energy equals more amplitude

9

How is sound/intensity related to amplitude

More amplitude equals louder sound

10

How is energy related to light

More energy equals Brighter light , more intense

11

Wavelength

Distance between two consecutive rarefactions or compressions
(Crests or troughs )

12

Crest

Top of wave

13

Trough

Bottom of wave

14

What determines the type of electromagnetic wave

Wavelength

15

Type of waves from longest to shortest

Radio, micro, infared, visible, ultraviolet, X-Ray, gamma

16

What dos shorter wave length means

Shorter equals more energetic and frequency

17

Frequency

Number of waves per second, how many waves pass a ser per second

18

Hertz

One wave per second

19

At a SET speed what is the relationship between frequency and wavelength

When frequency increases wavelength decreases

20

What does frequency of light determine

Color

21

Pitch

Frequency of sound

22

How are frequency and pitch related

When frequency increase so does pitch

23

Faster the vibrations means

Higher pitch/frequency

24

Ultrasonic

Higher pitch

25

What is the range of audible sound

20- 20,000 hz

26

Subsonic

Lower pitch

27

Period

Time for one wave to pass set point

28

How are periods and wave length related at a SET speed

Loner wave equals longer period at set speed

29

How are periods and frequency related

Higher frequency means shorter periods

30

Formula for frequency

F = 1/p

31

Formula for period

P= 1/f

32

Wave speed

How fast one crest is moving

33

Speed formula

Frequency X wavelength

34

How does speed of light change going through different mediums

Fastest in vacuum, then air, then water, then slowest in solid

35

Angel of incidence

Between incident wave and normal

36

Normal

Line perpendicular to object

37

Angel of reflectionn

Between normal and reflected wave

38

Angle of refraction

Angle of incidence

39

Diffuse reflection

Many directions, rough surface

40

Refraction

Wave bends due to change in speed, often Cause f change of medium

41

How does light react to dense mediums

Light does slower in denser mediums

42

How does sound react to dense mediums

Sound goes faster in more dense mediums

43

Diffraction

Bending of waves around a barrier

44

Interference

Two waves combine to form a new wave

45

Two types of interference

Constructive and destructive

46

Constructive

\/\/\/\ + \/\/\/\ = \/\/\/\/\/\
Crests overlap to create larger amplitude

47

Destructive

\/\/\/\ + /\/\/\/ = ------
Crests line up with trough to cancel out

48

Echo

Reflection

49

Which is faster speed of light or speed of sound

Speed of light

50

Speed is determined by what

Medium and temp

51

What temp is sound fastest

Warm

52

Ultra sound

Higher frequency then humans can hear
>20,000hz

53

What is ultra sound used for

Echocardiograms
Echolocation
Ultrasounds

54

What type of objects reflect sound best

More dense objects

55

What does sonar stand for

SOund
Navigation
And
Ranging

56

Distance formula

1/2 time X speed of sound

57

What type of wave is a sound wave

Longitudinal

58

What type of wave is light

Electromagnetic transversals

59

What is a light wave

A disturbance of the electrical and magnetic fields which transports energy in the form of a photon

60

How are electro and magnetic fields related to each other in light

They are at right angles to one another
When one is /\/\/\/
The other is
/
\
/
\

61

What is the light disturbance caused by

A photon

62

Photon

Particles of light, packets of energy, emitted when an electron drops down to a lower level

63

Frequency of sound wave created depends on what

Amount of energy in photon, high energy photon equals high frequency light wave

64

What are the types of transmission of light

Opaque
Transparent objects
Scattering

65

Opaque

Don't transmit only absorb or reflect

66

Transparent objects

Transmit into straight line

67

Scattering

Molecules absorb light and scatter in all directions

68

Opaque objects

Regretted over wavelengths
Color reflected is the color we see
If all reflected we see white
If all absorbed we see black

69

Scattering objects

Small molecules scatter high frequency

70

N2 and O2 of air scatter what colors

Violet and blue

71

Very large particles do what

Absorb light and are opaque

72

Why is the sky blue

Because the small molecules in the atmosphere scatter small blue light so blue stays in the atmosphere longer

73

Why are clouds white

Water droplets are all different sizes which reflect all different wavelengths of light= white

74

Wave

A disturbance that moves energy through space

75

Why are storms grey

Large water drops absorb all colors the bigger he drops the darker the clouds= black

76

What travels along the wave path

Energy

77

What type of wave is sound

Longitudinal

78

What does increased amplitude change in sound and light waves

Sound becomes Louder, light becomes brighter

79

What is the law of reflection

The angle of incidence equals the angle of reflection

80

When light bends into a denser medium does it bend toward or away from normal

Toward normal

81

Why is the sunset red

Sunsets and sunrises are red because at sunset the sunlight has to travel through more atmosphere than at other times of day so very little of the shorter wavelength light makes it all the way through. Very little red light is scattered because of its long wavelength so red light makes it through to your eye.

82

Explain the Doppler effect

Doppler effect is a change in pitch caused my a moving sound emitter or light emitter. Observer 2 would hear the higher pitch sound because the object is moving toward observer 1.

83

What causes echoes

Reflection of sound waves off of hard flat surfaces

84

What waves are longer than visible and what are shorter

Longer: radio, tv, micro, infared
Shorter: ultraviolet, X-ray, gamma

85

What two fields are disturbed by the passage of a photon and what type of wave does this create

Electro and magnetic and it creates an electromagnetic transverse wave

86

Can light travel through space

Yes any electromagnetic wave can