| A | B |
|---|
| Frequency | cycles per second |
| Period | time per cycle |
| Audible Sound | 20 HZ to 20,000 HZ (20KHz) |
| Infra Sound | Below 20Hz |
| Ultra Sound | Above 20,000Hz or 20MHz |
| Clinical Ultrasound Range of Frequencies | 2MHz to 10MHz |
| Wavelength | length of one cycle |
| wavelength unit | mm or meters |
| period unit | time: microsec (us) or millisec (ms) |
| Propagation Speed | rate of speed at which sound travels |
| Propagation Speed Unit | mm/us or m/s (see they match) |
| Stiffness (another name for) | Bulk Modulus |
| Stiffness Opposite | elasticity/compressability |
| 1540 m/sec | speed of sound in soft tissue |
| velocity | speed and direction |
| amplitude | difference between the peak value and the mean value of a waveform |
| amplitude unit | decible |
| power | total energy transmitted to a medium |
| power unit | watts |
| Intensity | amount of energy transferred to a particlular area |
| Intensity unit | W/cm2 (squared) |
| Intensity Purpose | Measures bioeffects and ultrasound dose |
