http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel/waves/
http://revise-physics.net/IGCSE/pdf/P9Waves.pdf
http://www.gcse.com/waves.htm
http://www.physicsclassroom.com/Class/waves/
http://library.thinkquest.org/10796/
Copy – paste the above links on address bar to study waves in detail
![](data:image/svg+xml;charset=utf-8,<svg height="20" width="40" xmlns="http://www.w3.org/2000/svg" version="1.1"/>)
![](data:image/svg+xml;charset=utf-8,<svg height="22" width="120" xmlns="http://www.w3.org/2000/svg" version="1.1"/>)