1. Simple Harmonic Motion
Displacement
Amplitude
Frequency
Period
Phase difference
Compression, rarefactions
Definition of simple harmonic motion
a = - ω2 x

2. Equations of simple harmonic motion
Graphical
Interchange between kinetic and potential energy

3. Damping
Natural frequencies
Resonance

4. Pulse vs progressive (traveling) wave
Transverse/longitudinal
Amplitude, frequency, period, wavelength, speed
Orders of magnitude of electromagnetic waves

5. Reflection
Snell’s law
Speed/frequency/wavelength at boundaries

6. Diffraction
Wavelength vs opening
Superposition
Path difference in interference