SPH3U1
8.1 What is a Vibration?
Read 8.1 and 8.2
There are three types of waves:
1. Mechanical waves require a material medium to travel (air, water, ropes). These waves are
divided into three different types.
Transverse waves cause the medium to move perpendicular to the direction of the wave.
Longitudinal waves cause the medium to move parallel to the direction of the wave.
Surface waves are both transverse waves and longitudinal waves mixed in one medium.
2. Electromagnetic waves do not require a medium to travel (light, radio).
3. Matter waves are produced by electrons and particles.
By moving a rope once, a single vibration is produced. This is a pulse.
By moving a rope regularly up and down, a traveling or periodic wave is produced
{from http://library.thinkquest.org/10796/ch8/ch8.htm}
Vibration  The cyclical motion of an object about an equilibrium point. [cause]
Mechanical Wave The transfer of energy through a material due to vibration [effect]
Medium The material through which a wave travels
Particle Behaviour in Different Media:
Media Type
Speed and Distance of wave
Solid – most dense
Faster and they travel farther
Liquid
Gas – least dense
slower and they don’t travel as far
8.2 Types of Mechanical Waves
Transverse Wave  particles vibrate perpendicular to the direction of the flow of energy.
Draw it:
Longitudinal Wave  particles vibrate parallel to the direction of the flow of energy.
Sound  waves that are detectable to the human ear
Your Work: Read 8.1 and 8.2
Complete:
p.380 # 1, 3-5
p. 384 #1-3, 5-7