Sound of Music

Student Book

3.2 Active noise control

http://www.acoustics.salford.ac.uk/feschools/waves/super3.htm

Teacher Guide

Additional sheet 8
If you want to explore the science of waves, sound and light further, here are some useful places to start.

Wikipedia
http://en.wikipedia.org/wiki/Acoustics

The National Physical Laboratory
http://www.npl.co.uk/acoustics/

Sounds Amazing
This is a website run by the University of Salford. It has a very useful section for AS and A level students, with explanations of various wave phenomena, including animations and video footage:
http://www.acoustics.salford.ac.uk/feschools/

The NTNUJAVA Virtual Physics Laboratory
http://www.phy.ntnu.edu.tw/ntnujava/index.php?board=3.0
This has a number of simulations of wave phenomena that you might find useful. These include combining simple waveforms to make more complex ones. You can see the resultant waveform change immediately and hear the corresponding changes in sound, as you make the adjustments.

For Snell's law
http://www.physics.uoguelph.ca/applets/Intro_physics/refraction/LightRefract.html
http://www.walter-fendt.de/ph11e/huygenspr.htm

Diagrams of CD optics
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/cdopt.html

Various interactive Java applets
http://www.kamikawas.com/physics/java_e.htm