1. The Equation for Velocity of Waves on a String
Hopefully you will have seen a slinky at school and observed a wave moving along it. The speed of a wave along a string really depends on the tension in the string and also the mass per unit length. Simple.
2. Practical - Standing Waves on a String
Waves transfer energy. They can also store energy and not go anywhere at all.
3. Standing Waves on a String
Standing (or stationary) waves on strings are formed when a wave reflects from the fixed end of a string and then by superposition it combines to make points of maximum displacement (antinodes) and points of no-displacement (nodes).
4. Standing Waves in a Tube
Stationary (or standing) waves can also form in a column of air which is the basis behind many musical instruments.