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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
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

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

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?