Everyone has seen waves on water, heard sound waves and seen
light waves. But, what exactly is a wave? Of course, the goal of
this course is to answer this question for you. But for now you
can think of a wave as a traveling or oscillatory disturbance in
some continuous medium (air, water, the electromagnetic field,
etc.). As we shall see, waves can be viewed as a collective
e↵ect resulting from a combination of many harmonic
oscillations. So, to begin, we review the basics of harmonic
motion. harmonic oscillition, traveling wave, chapter 1, one
Torre, Charles G., "01 Harmonic Oscillations" (2012).
Foundations of Wave Phenomena. Book 22.