Physics 312 Lecture: "Wave Motion I."
Apr 2, 1998
-  Transverse waves feature displacement perpendicular to the
       direction of wave motion.
 -  Longitudinal waves feature displacement parallel to the
       direction of wave motion.
 -  A travelling wave must have form f(x - vt)
 -  When two waves meet, the result is the algebraic sum 
       of the individual wave equations;
       this is the Principle of Linear Superposition
 -  A wave moving a string of linear mass density mu,
       and tension force F, has speed
          v = sqrt(F/mu)
       
 
This lecture discusses material in Chapter 16 of Serway.