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Waves

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Chapter 14 Waves 14.1 Types of waves What is a wave? A wave is a _____ Most waves travel through a _____ A medium is ... – PowerPoint PPT presentation

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Title: Waves


1
Chapter 14
  • Waves

2
14.1 Types of waves
  • What is a wave?
  • A wave is a _________________________
  • Most waves travel through a ____________
  • A medium is ________________________

3
14.1 Types of waves
  • There are two basic types of waves
  • Mechanical wave ______________
  • Almost ______ waves are mechanical
  • Electromagnetic (EM) wave _____________
  • AKA a _________ wave

4
14.1 Types of waves
  • Light _________ require a medium. This allows the
    sun to transmit energy to the Earth through empty
    space.
  • Visible light waves are just one example of light
    waves. Remember that light waves may refer to
    waves we cannot see like _________________________
    __________

5
14.1 Types of waves
  • Earlier you learned that energy can be defined as
    the ability to do work.
  • We know that waves carry ____________ because
    they can do ___________
  • Some examples are
  • _______ waves moving a leaf , boat, or beach
  • _______ waves moving your chest and eardrum

6
14.1 Types of waves
  • If you stand next to the speakers at a concert,
    the sound may damage your ears. Likewise, if you
    look at a bright light bulb from too close, the
    light may damage your eyes. But if you are 100
    meters away, the sound or light is harmless. Why?

7
14.1 Types of waves
  • Describe the waves created when a stone is
    dropped into a pond.
  • The waves spread out in _________that get ______
    as the wave moves farther from the center.
  • Each of these circles is called a
    __________________.

8
14.1 Types of waves
  • Each wave front has the ________ amount of total
    __________.
  • But as the circles get _________, the energy
    spreads out over a larger area, giving it less
    ___________ in a single spot.
  • When sound waves travel in ___, the waves spread
    out in ______, causing their energy to spread
    like the water waves.

9
14.1 Vibrations and waves
  • When a singer sings a note, the vocal cords in
    the singers throat move _____________.
  • This motion make the air in the throat vibrate,
    creating _________________ that eventually reach
    your ears.
  • The vibration of the air in your ears causes your
    ______________________.

10
14.1 Vibrations and waves
  • Most waves are caused by _______ objects.
  • EM waves may be caused by vibrating
    _____________________.
  • In mechanical waves the particles in the _______
    vibrate as the wave ____________ the medium

11
14.1 Vibrations and waves
  • Vibrations involve _____________ of energy
  • What happens if you lift or pull on the mass
    pictured here?
  • This is called ________________

12
14.1 Vibrations and waves
  • Waves can pass trough _______________________.
  • _________________________________________.

13
14.1 Vibrations and waves
  • The motion of particles in a _______ is like the
    motion of the attached masses on springs
  • As one particle _______________________

14
14.1 Transverse and longitudinal waves
  • Particles in a medium can either vibrate
    __________________________________.
  • Waves are classified by the direction they move
    into three basic types

15
14.1 Transverse waves
  • Transverse wave
  • Examples

16
14.1 Longitudinal waves
  • Longitudinal wave
  • Examples

17
14.1 Surface waves
  • Waves in the ocean or a pool are
    __________________________________.
  • They occur at the ________ between two
    ___________ mediums (i.e. ___________)
  • The particles in a surface wave move both
    ____________________ to the direction of the wave
    giving it a _______ motion overall

18
14.1 Surface waves
19
14.2 Characteristics of waves
  • All transverse waves have the same basic shape
  • A sine wave looks like

20
14.2 Parts of a transverse wave
  • Crest
  • Trough
  • Amplitude
  • Node

21
14.2 Parts of a transverse wave
22
14.2 Parts of a longitudinal wave
  • Compression
  • Rarefaction

23
14.2 Parts for both waves
  • Wavelength
  • Period
  • Frequency
  • Frequency-Period Equation
  • Frequency

24
14.2 Wave speed
  • Speed v
  • How do we measure distance in a wave?
  • How do we measure time in a wave?
  • If we replace distance and time with our new
    measures we end up with
  • Speed
  • Now we can replace 1/t

25
14.2 Wave speed equation
  • Wave speed is
  • Wave speed equation equals
  • Wave speed
  • v
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