For further explanation:
If you want to test yourself, I suggest Quizlet.com. It’s the best:D
http://quizlet.com/5163192/test
http://quizlet.com/4232084/test
http://quizlet.com/20534358/test
Also, you should try these flashcards:
http://quizlet.com/24095236/waves-light-and-sound-physics-igcse-flash-cards/
And here are some games!!!!
http://www.physicsclassroom.com/Physics-Interactives/Waves-and-Sound