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Waves and Sound

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Waves and Sound Honors Physics Chapter 14 Definition of a wave A disturbance that propagates from 1 place to another. Characterized by a large transfer of energy ... – PowerPoint PPT presentation

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Title: Waves and Sound


1
Waves and Sound
  • Honors Physics
  • Chapter 14

2
Definition of a wave
  • A disturbance that propagates from 1 place to
    another.
  • Characterized by a large transfer of energy
    without a large transfer of medium

3
Types of waves
  • Mechanical waves require a medium (air, water,
    ropes) to travel
  • Electromagnetic waves do not require a medium to
    travel (light, radio)

4
Mechanical Waves
  • Transverse the displacement of the individual
    particles is perpendicular to the direction of
    propagation.

5
Mechanical Waves
  • Longitudinal The displacement of the individual
    particles is parallel to the direction of
    propagation.

6
Waves in motion
  • Longitudinal and Transverse Wave Motion

7
Properties of waves
  1. Amplitude (A) the maximum displacement from
    equilibrium position, measured in meters.
  2. Wavelength ( ?) the distance between 2 particles
    that are in phase with each other, measured in
    meters.

8
Wave diagram
9
Properties of waves
  • 3. Frequency (f) number of complete waves that
    pass a point in one second, measured in 1/seconds
    or Hertz (Hz)
  • 4. Period (T) the time it takes for one complete
    wave to pass a given point, measured in seconds.

10
Properties of waves
  • Velocity of propagation (v) horizontal speed of
    a point on a wave as it propagates, measured in
    m/s.

11
Relationships/equations
  • T 1/ f
  • or f 1/T
  • v f ?

12
Reflections
  • Fixed End
  • Explanation
  • Animation
  • Open End
  • Explanation
  • Animation
  • Between different mediums scroll down (What do
    you notice about the phases? Transmitted?
    Reflected?)

13
Principle of Superposition
  • Occurs when two waves travel through the same
    medium at the same time.
  • Each wave affects the medium independently.
  • The displacement of the medium is the algebraic
    sum of the displacements.
  • Animation (scroll down) new animation

14
Interference
  • Constructive occurs when wave displacements are
    in the same direction (in-phase) video
  • Destructive occurs when wave displacement are in
    different directions (out-of-phase) video

15
Frequency
  • Light
  • BACK
  • Audible range 20-20,000 Hz (listen)
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