| Answer | Crossword Clue |
|---|---|
| DECIBEL | Unit for measuring volume of sound. |
| DECIBEL | Unit for measuring sound. |
| MACH | Unit in measuring speed of sound. |
| BEL | Sound measuring unit |
| BEL | Sound-measuring unit |
| LUMEN | Unit for measuring flow of light |
| FERMI | Unit of length used for measuring nuclear distances |
