Waves in 1 -Dimension

What causes a wave?

repeated periodic motion

www.bottomlayer.com/bottom/reality/Chap1.html

http://recentearthquakes.net/resources/

www.privateline.com/.../soundwaves.html <http://www.privateline.com/TelephoneHistory/soundwaves.html>

https:/.../wiki/4fa0b/ <https://wiki.ucfilespace.uc.edu/groups/seancunningham_09a_32artn522001/wiki/4fa0b/>

www.smh.com.au/.../2003/02/21/1045638485516.html <http://www.smh.com.au/articles/2003/02/21/1045638485516.html>

recentearthquakes.net/5.html <http://recentearthquakes.net/5.html>

What the heck is a wave anyway?

Pulse:

Wave:

Mechanical Waves

ie: Sound in airwater wavescracking a whipearthquake

Electromagnetic Waves

Speed of light = c = 3.00 x 108 m/s = 3.00 x 108 ms-1

Types of Mechanical Waves

Transverse - waves where the direction of the action causing the oscillations is oscillation is perpendicular ( ) to the direction of the resulting wave. (ie shaking a string up and down.)

Direction of motion of energy transfer Direction of m

otion of particles in the m

ediumdirection of motion of atoms

equilibrium or rest position

the particles start at rest and return to rest after the energy in the wave has passed.

The energy in the wave moves on.The particle stays put.

Types of Mechanical WavesLongitudinal - waves where the direction of the action causing the oscillation is parallel ( ) to the direction of the resultant wave. (imagine pushing a slinky in and then pulling it back to the starting point.

Direction of motion of particles

Direction of motion of energy

Particles at Rest - particles are equally spaces

A)

B)

Anatomy of a Wave

Crest

Wavelength ( λ)

Wavelength ( λ)

Wavelength ( λ)

Wavelength ( λ)

Amplitude

Amplitude

Wavelength ( λ)

Wavelength ( λ)

Transverse Wave

Trough

Longitudinal Wave

compressionrarefaction

Amplitude

Amplitude - The maximum displacement of a particle in the medium from the rest or equilibrium position.

The amplitude of a wave is a measure of the energy being transferred.

A 2 A

A

*large amplitudes takes more energy to produce.

Think tidal wave vs ripple

Period and Frequency

Defn:Frequency

Period:

Example 1A sound wave has a frequency of 262 Hz. What is the time between crests?

The Wave Equation

Example 2A sound wave has a frequency of 262 Hz and a wavelength of 1.29m. What is the speed of the wave?

http://www.physicsclassroom.com

Homework

Blue Wave Packet pages 1-4