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Waves

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Waves Physics Mrs. Coyle Coyle, Greece 2005, North Aegean Sea Waves and their characteristics Velocity of a wave Types of waves Oscillation Object moves back and ... – PowerPoint PPT presentation

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Title: Waves


1
Waves
  • PhysicsMrs. Coyle

Coyle, Greece 2005, North Aegean Sea
2
  • Waves and their characteristics
  • Velocity of a wave
  • Types of waves

3
Oscillation
  • Object moves back and forth about an equilibrium
    position.

4
Pulse A single disturbance travelling through a
medium.
http//www.dacc.edu/qchen/P102/labs/LAB5.HTM
5
Wave Train (Travelling Wave or simply wave)
  • A series of pulses at regular intervals.

http//micromachine.stanford.edu/hopcroft/Researc
h/resonator_images/sin_mov1.gif
6
Wave on a String
  • (Applet) http//phet.colorado.edu/sims/wave-on-a-
    string/wave-on-a-string_en.html

7
Graph of Displacement vs Time
8
Displacement vs Distance Traveled
9
Speed of a Wave, v
  • v d/t
  • v l/T v lf

10
Types of Waves
  • Transverse
  • Longitudinal

11
Transverse
  • The particles vibrate perpendicular to the
    direction of the wave's propagation
  • (ex waves along a string, electromagnetic
    waves).

12
Example S Earthquake Wave
http//web.ics.purdue.edu/braile/edumod/waves/Swa
ve_files/image001.gif
13
Longitudinal Waves
  • The particle displacement is parallel to the
    direction of wave propagation (ex sound)

14
Torsional Waves
  • Video link on Web Collapse of Takoma Narrows
    Bridge, Washington State, 1940
  • http//www.youtube.com/watch?vshX4Q0QV8VI

15
Elliptical Waves
  • Result when longitudinal and transverse waves
    are superpositioned.
  • (ex surface water waves)

16
Ocean Wave
17
Ocean Wave
http//www.pa.uky.edu/crawford/phy361_sp10/home.h
tml
18
Note
  • Waves transfer of energy from one point to
    another.
  • Waves do not transfer matter.

19
Types of Waves
  • Mechanical Waves
  • Electromagnetic Waves

20
Mechanical Waves require a medium.
  • Examples
  • Water waves( Tsunami)
  • Sound waves (v 340 m/sec in air but varies for
    different media)
  • Earthquake waves

21
Electromagnetic Waves do not require a medium and
can travel through the empty space (vacuum).
  • Example 
  • Light from the sun travels through space and
    reaches us.
  • Note All EM waves have a speed through vacuum of
    3 x 108 m/sec.

22
Problem 1
  • What is the distance a sound wave in air traveled
    in 2 sec?Answer 680m/s

23
Problem 2
  • What is the frequency of a light wave of wave
    length 550x 10-9 m?
  • Answer 5.5 x 10 14 Hz

24
Problem 3
  • A SONAR (Sound Navigation and Ranging) sends a
    signal to the bottom of the ocean. The speed of
    sound in water is 1435 m/s. If the signal echo
    returned in 0.4 sec, how deep was the water?
  • Answer 287m
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