Solution to the wave equation, t = 0 Speed: Quick jump: 

A graph of y = f_{n,k}(x), , normalized such that f_{n,k}(0) = 1. 

A graph of The maximum is 
Solution to the wave equation, t = 0 Speed: Quick jump: 

A graph of y = f_{n,k}(x), , normalized such that f_{n,k}(0) = 1. 

A graph of The maximum is 