compression
compression
rarefaction
Label the following: rarefaction, compression, amplitude, rest
(equilibrium) amplitude
Bridge Collapse
h"p://www.youtube.com/watch?v=j-­‐zczJXSxnw&safe=ac?ve
Standing Wave application
swave.exe
Standing or Stationary Waves
A Special Case of Interference
Description
When two or more waves of the same wavelength, and
speed and equal or nearly equal amplitude travelling in
opposite directions meet a standing or stationary wave
results.
This is a special type of superposition
Node: the point where the algebraic sum of the displacement of
the incident and reflected waves is always zero.
Antinode: the point where the algebraic sum of the
displacements of the incident and reflected waves is always a
maximum.
Check out:
http://www.physicslab.co.uk/swave.htm
http://www.walter-fendt.de/ph14e/?stwaverefl.htm
-The first mode of vibration has the lowest frequency
-The first mode is known as the "Fundamental" or "first harmonic"
-Each mode after is known as the second, third, fourth.... harmonic
-Each harmonic has twice the frequency of the previous harmonic.
ie. f2 = 2 f1
Number of loops
Inter-nodal Distance
Stationary waves of frequency 100.0 HZ are produced in a medium with a velocity 400 ms-1.
What is the inter-nodal distance (i.e the distance between adjacent nodes)?
Homework
Green Booklet Pages 7 + 8
Orange Booklet p 34-36
Friday - Time to Work/Study and ask Questions
Unit Test Monday