| Answer | Crossword Clue |
|---|---|
| RCA | Initials in radio field. |
| CBS | Famous initials in radio. |
| VOA | Important initials in radio. |
| TESLA | Inventor in radio field. |
| frequency | The rate at which a vibration occurs that constitutes a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light), usually measured per second |
| frequencies | The rate at which a vibration occurs that constitutes a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light), usually measured per second |
