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Flashcards in Waves Deck (75):
1

a wave is a

transfer of energy

2

examples of waves

vibrations, sound, water, seismic

3

2 general catagories of waves

electrogmagnetic and mechanical

4

What are electromagnetic waves & exampls

- waves that are produced by the back and forth motion of tiny particles - they travel through space requiring no material (medium). They can transmit energy through a vacum - ex. light, radio, x-rays, infrared

5

what are mechanical waves & ex

- waves that deal w/ matter and mass - they travel through a medium ex. sound, water waves, jump rope waves

6

T/F they both require a medium in order to exist

T

7

What are 3 types of mechanical waves

- transvere waves, longitudinal, surface

8

transverse waves

- a wave in which particles of the medium move in a direction perpendicular to the direction that the wave moves

9

longitudinal waves

waves in which particles of the medium move in a direction parallel to the direction that the wave moves (sound wave) - only longitudinal waves can travel through liquids

10

surface waves

a wave in which particles of the medium undergo a circular motion

11

medium

the matter that the wave moves through

12

crest

top part of the wave

13

trough

bottom part of the wave

14

amplitude (A)

magnitude of a wave

15

Wavelength

distance for one complete wave (m)

16

period (T)

time for one complete wave to pass a point

17

Frequency (f)

number of crests that pass a particular point per unit of time - measured in Hz

18

wave equation

speed = frequency X wavelength

19

As a wave travels through a medium what will often happen?

it will often reach the end of the medium and encounter an obstacle or perhaps another medium through whitch it could travel

20

when one medium ends and another begins; the interface of the two mediums are called

a boundry

21

the behaviour of a wave at that boundry is described as

boundry behaviour

22

what does not change as waves move from one medium into another

frequency

23

what are the 2 most common behaviours of the wave

reflection or refraction

24

when does reflection occur

when a wave hits another boundry and reflects back

25

when does refraction occour and what is it

refraction is the bending of a wave it occurs when the wave hits an object at an angle or enters a new medium it results from the change in a wave's speed

26

SPEED OF A WAVE - depends on - speed of water waves depend on - speed of rope waves depend on - speed of sound in air depends on

- properties of the medium - depth of water - force extered on the rope - temp (lower=denser=slower)

27

T/F waves can be at the same place at the same time

T

28

What is the superposition principle

when one or more waves occupy the same space at the same time, the displacements add at every point

29

what is the result of the superposition of two or more waves called

interferance

30

within an interferance pattern wave effects may be

increased, decreased, neutralized

31

Constructive interferance

- occurs when the individual effects of each wave added together produces a wave of increased amplitude

32

destructive interferance

- occurs when the individual effects of each wave added together produces a wave of decreased amplitude

33

how are standing waves formed

the waves that occour when two sets of waves of equal amplitude and wavelength pass through each other in opposite directions - the waves are steadily in and out of phase with each other - occour when a wave reflects upon itself

34

What are nodes

points of zero displacement (low energy)

35

what are the points of maximium displacement (high energy)

antinodes

36

Dopler Effect

- the shift in frequency due to motion of a vibrating source toward or away from a receiver - the pitch (frequency) of sound increases when a source moves towards you decreases when the source moves away -ex siren

37

what is produced when a wave sources moves as fast as the waves it produces

a wave barrior

38

an airplance travelling at the speed of sound creates a wall of compressed air called the..

sound barrior

39

the cone shaped disturbance made by an object moving a supersonic speed through a fluid (air or water) is called a

shock wave

40

an airplane that is travelling faster than the speed of sound creates a.. that you hear as a..

creates a shock wave hear as a sonic boom

41

an observer on the ground hears a sonic boom when the an airplaine is travelling at ____ speed than the speed of sound

greater

42

transfer of energy

a wave is a

43

vibrations, sound, water, seismic

examples of waves

44

electrogmagnetic and mechanical

2 general catagories of waves

45

- waves that are produced by the back and forth motion of tiny particles - they travel through space requiring no material (medium). They can transmit energy through a vacum - ex. light, radio, x-rays, infrared

What are electromagnetic waves & exampls

46

- waves that deal w/ matter and mass - they travel through a medium ex. sound, water waves, jump rope waves

what are mechanical waves & ex

47

- transvere waves, longitudinal, surface

What are 3 types of mechanical waves

48

- a wave in which particles of the medium move in a direction perpendicular to the direction that the wave moves

transverse waves

49

waves in which particles of the medium move in a direction parallel to the direction that the wave moves (sound wave) - only longitudinal waves can travel through liquids

longitudinal waves

50

a wave in which particles of the medium undergo a circular motion

surface waves

51

the matter that the wave moves through

medium

52

top part of the wave

crest

53

bottom part of the wave

trough

54

magnitude of a wave

amplitude (A)

55

distance for one complete wave (m)

Wavelength

56

time for one complete wave to pass a point

period (T)

57

number of crests that pass a particular point per unit of time - measured in Hz

Frequency (f)

58

speed = frequency X wavelength

wave equation

59

it will often reach the end of the medium and encounter an obstacle or perhaps another medium through whitch it could travel

As a wave travels through a medium what will often happen?

60

a boundry

when one medium ends and another begins; the interface of the two mediums are called

61

boundry behaviour

the behaviour of a wave at that boundry is described as

62

frequency

what does not change as waves move from one medium into another

63

reflection or refraction

what are the 2 most common behaviours of the wave

64

when one or more waves occupy the same space at the same time, the displacements add at every point

What is the superposition principle

65

interferance

what is the result of the superposition of two or more waves called

66

- occurs when the individual effects of each wave added together produces a wave of increased amplitude

Constructive interferance

67

- occurs when the individual effects of each wave added together produces a wave of decreased amplitude

destructive interferance

68

the waves that occour when two sets of waves of equal amplitude and wavelength pass through each other in opposite directions - the waves are steadily in and out of phase with each other - occour when a wave reflects upon itself

how are standing waves formed

69

points of zero displacement (low energy)

What are nodes

70

antinodes

what are the points of maximium displacement (high energy)

71

- the shift in frequency due to motion of a vibrating source toward or away from a receiver - the pitch (frequency) of sound increases when a source moves towards you decreases when the source moves away -ex siren

Dopler Effect

72

a wave barrior

what is produced when a wave sources moves as fast as the waves it produces

73

sound barrior

an airplance travelling at the speed of sound creates a wall of compressed air called the..

74

shock wave

the cone shaped disturbance made by an object moving a supersonic speed through a fluid (air or water) is called a

75

creates a shock wave hear as a sonic boom

an airplane that is travelling faster than the speed of sound creates a.. that you hear as a..