| A | B |
|---|
| Wavelength | Distance between wave crests (or troughs) |
| Frequency | Number of waves that pass a given point per unit time |
| Amplitude | The maximum height of the wave or maximum pressure of a compression wave |
| Doppler effect | Apparent frequency shift of a wave due to relative velocities between the source and observer |
| Longitudinal wave | Energy is transmitted in the same direction as medium particle vibration |
| Transverse wave | Energy is transmitted perpendicular to the direction of medium particle vibration |
| Wave speed | Depends on the density of the wave transfer medium (air, water,steel, etc.) |
| Sound intensity | Symbol is I. Unit is watts/m^2. |
| Speed of sound in a vacuum | Zero |
| Reflection | The principle where a wave leaves the surface it was incident on with the same angle, measured perpendicular to the surface. |
| Refraction | The bending of a wave as it passes through mediums of different densities (e.g. air into water). |
| Interference | Two (or more) waves pass through the same region of space at the same time. |
| Diffraction | The bending of waves as they encounter an obstacle |
| Standing waves | Large amplitude wave produced by constructive interference. Wave appears stationary. |
| Resonant frequency | The natural frequencies of standing waves produced. |
