Speed of waves
http://www.thephysicsaviary.com/Physics/Programs/Labs/WaveOnStringLab/index.html
Doppler Effect
Doppler Effect
Reflection free/fixed
Standing waves, harmonics, transvers, longitudinal
http://www.physicsclassroom.com/Physics-Interactives/Waves-and-Sound/Standing-Wave-Patterns
Doppler Effect
Reflection
Standing waves