Waves - PowerPoint PPT Presentation

Loading...

PPT – Waves PowerPoint presentation | free to download - id: 410972-NzhmM



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Waves

Description:

Beats Interference of sound waves produces beats. The beat frequency refers to the rate at which the volume is heard to be oscillating from high to low volume. – PowerPoint PPT presentation

Number of Views:231
Avg rating:3.0/5.0
Slides: 49
Provided by: SolonBoar52
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Waves


1
Waves
  • Chapter 14

2
Wave at the Shoe
3
Types of Waves
  • A wave is a disturbance that carries energy
    through matter or space.
  • The medium is the matter through which a wave
    travels.
  • Waves that require medium are called mechanical
    waves.

4
What is the wave called when it requires a medium?
  1. mechanical
  2. longitudinal
  3. surface
  4. transverse

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
5
Transverse waves
  • Transverse waves are waves which the motion of
    the particles is perpendicular to the motion of
    the wave.
  • The top of the wave is called the crest.
  • The bottom of the wave is called the trough.
  • The distance between the crest on one wave to the
    crest on the next is called the wavelength.

6
Longitudinal wave
  • Longitudinal waves are waves where the particles
    in the medium vibrate parallel to the direction
    of the wave motion.
  • Compressions are the parts of the wave where the
    medium is compressed.
  • Rarefactions are parts of the wave where the
    medium is spread apart.
  • The distance between compressions is the
    wavelength.

7
Surface waves
  • Surface waves occur at the boundary between two
    mediums.
  • The particles move both perpendicularly and
    parallel.

8
Which type of wave motion of the particles is
perpendicular to the motion of the wave?
  1. longitudinal.
  2. seismic.
  3. surface.
  4. transverse.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
9
Wave Properties(continued)
  • Wavelength is the distance from one crest to the
    crest of the next wave.
  • Period is the time required for one full
    wavelength of a wave to pass a certain point.
  • Frequency of a wave is the number of full
    wavelengths that pass a point in a given time
    interval.

10
Wave Properties
  • Transverse waves have the shape of a sine curve.
  • Highest point of a transverse wave is a crest.
  • Lowest point of a transverse wave is a trough.
  • Amplitude is the greatest distance that particles
    are displaced from their normal resting position.

11
In which type of a wave does the particles travel
perpendicular to the direction of the wave?
  1. longitudinal
  2. transverse
  3. surface
  4. none of the above

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
12
What is the top part of a wave called?
  1. amplitude
  2. compression
  3. crest
  4. trough

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
13
What do we call is the distance between two crest
on a transverse wave?
  1. amplitude
  2. frequency
  3. period
  4. wavelength

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
14
Frequency-Period Equation
  • Frequency1/period
  • F1/T
  • Frequency is measured in a unit called a hertz.

15
Wave Speed
  • wave speedfrequency x wavelength
  • v f x ?

16
What unit is frequency measured?
  1. joules
  2. hertz
  3. meters
  4. newtons

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
17
Doppler Effect
  • The Doppler Effect is the changed in the observed
    frequency of a wave resulting from the motion of
    the source or observer.
  • As the source is approaching the observer, the
    wavelength decreases and the pitch increases.
  • As the source is going away from the observer,
    the wavelength increases and the pitch decreases.

18
Doppler Effect
19
As a fire truck approaches you, what happens to
the sound?
  1. pitch increases.
  2. wavelength decreases.
  3. sound gets louder.
  4. all the above.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
20
Reflection
  • Reflection is the bouncing back of a wave when it
    meets a surface or boundary.

21
Diffraction
  • Diffraction is when a wave bends around an object
    or opening.

22
Refraction
  • Refraction is the bending of a wave as it passes
    from one medium to another medium.

23
A transverse wave..
  1. Vibrates particles perpendicular to the direction
    of wave
  2. Vibrates particles parallel to the direction of
    the wave
  3. Vibrates both parallel and perpendicular to the
    direction of the wave
  4. Vibrates particles in one direction
  5. I dont get it.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
24
In the diagram, identify the wave property A
  1. Frequency
  2. Amplitude
  3. Wavelength
  4. I dont know

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
25
What type of a wave interaction involves a wave
bending as it passes from one medium into another?
  1. diffraction
  2. reflection
  3. refraction
  4. I dont know

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29
26
Wave Interference
  • Wave interference is when several waves are in
    the same location and the waves combine to
    produce a single, new wave that is different from
    the original waves.

27
Constructive Interference
  • The result of two individual waves coming
    together to produce a wave of greater amplitude
    is called constructive interference.

28
Destructive Interference
  • The result of two individual waves coming
    together to produce a wave of lesser amplitude
    than the larger of the original waves is called
    destructive interference.

29
Interference
  • As two wave sources combine, the waves pattern
    changes.

30
Beats
  • Interference of sound waves produces beats.
  • The beat frequency refers to the rate at which
    the volume is heard to be oscillating from high
    to low volume.

31
Standing Waves
  • Standing wave is when the interference of the
    original wave with the reflected wave causes the
    medium to vibrate in a stationary pattern.

32
Standing Wave
  • Nodes are the areas of a standing wave where
    there are no vibrations.
  • Antinodes are areas of a standing wave where
    there is maximum vibration.

33
Longitudinal Wave
34
Transverse
35
Water Wave
36
Rayleigh Surface Wave
37
Review Questions
  • Name the three types of waves.
  • transverse, longitudinal surface
  • Which type of wave has the particles moving
    perpendicular to the motion of the wave?
  • transverse
  • Which type of wave has the particles moving
    parallel to the motion of the wave?
  • longitudinal

38
Review Questions
  • Which three things can a wave do when it meets a
    barrier?
  • reflect, diffract or refract
  • When the crest from one wave meets the crest of
    another wave, what happens?
  • constructive interference
  • What do you call the top of a transverse wave?
  • crest

39
Review Questions
  • On a longitudinal wave, what do you call the part
    of the wave that is spread out?
  • rarefaction
  • What is it called when the sound approaching you
    gets louder and fades as it is going away from
    you?
  • Doppler Effect

40
Review Questions
  • What happens when the crest of one wave meets the
    trough of another wave?
  • destructive interference
  • What type of interaction occurs when a wave
    strikes a barrier and bounces back?
  • reflection

41
Review Questions
  • What is the relationship between wave speed,
    frequency wavelength?
  • Wave speedfrequency x wavelength
  • What do we call the interference of waves of
    slightly different frequencies traveling in the
    same direction?
  • beat

42
Review Questions
  • What is the bottom part of a transverse wave
    called?
  • trough
  • What is the part of the longitudinal wave where
    the wave is pressed closely together?
  • compressions
  • What is the interaction of a wave called where
    the wave changes speed as it passes from one
    medium to another and bends?
  • refraction

43
Review Questions
  • What is the distance between two crests on a
    transverse wave called?
  • wavelength
  • What is the distance between a crest and the
    resting position called?
  • amplitude
  • What do we call the number of waves that pass a
    given point in a given amount of time?
  • frequency

44
Review Questions
  • What do we call the time it takes for one wave to
    move past a given point?
  • period
  • What happens to the frequency of a wave as the
    wavelength gets longer?
  • lowers
  • In which metric units do we measure frequency?
  • hertz

45
Review Questions
  • What is the material called that waves move
    through?
  • medium
  • What type of wave needs a medium to move?
  • mechanical
  • What do we call a disturbance that transfers
    energy?
  • wave

46
Review Questions
  • What type of wave is light?
  • transverse
  • What type of wave is sound?
  • longitudinal
  • What type of wave is produced when a wave is
    interfered with by its reflected wave?
  • Standing wave

47
Review Questions
  • What is the part of a standing wave called where
    there are no vibrations?
  • nodes
  • How does the medium affect the wave speed?
  • the closer the particles, the faster the wave
    speed
  • Where do surface waves occur?
  • boundary between two mediums

48
Internet Cites
  • http//id.mind.net/zona/mstm/physics/waves/interf
    erence/waveInterference2/WaveInterference2.html
  • http//id.mind.net/zona/mstm/physics/waves/interf
    erence/waveInterference1/WaveInterference1.html
  • http//id.mind.net/zona/mstm/physics/waves/partsO
    fAWave/waveParts.htm
  • http//micro.magnet.fsu.edu/primer/java/wavebasics
    /index.html
  • http//www.bbc.co.uk/schools/gcsebitesize/physics/
    waves/an_introduction_to_wavesrev4.shtml
About PowerShow.com