| Answer | Crossword Clue |
|---|---|
| MACH | Unit for speed of sound. |
| MACH | Unit of speed of sound. |
| MACH | Unit in measuring speed of sound. |
| MACH | Sound speed unit |
| KNOT | Speed unit for a yacht race |
| MHZ | Unit for a computer's clock speed (abbr.) |
| MACH | Physicist for whom a speed-of-sound ratio is named |
| DECIBEL | Unit for measuring volume of sound. |
| BEL | Unit of sound named for an inventor |
| DECIBEL | Unit for measuring sound. |
| BEL | Sound-intensity unit named for a Scottish-born inventor |
