Across
- 3. Used to transmit info between cellphones or between an internet router and a computer
- 7. A signal that is generated electronically
- 9. A region where light is obstructed or blocked
- 11. Used to transmit TV and radio programs
- 12. Does not allow light to pass through
Down
- 1. Allows some light to pass through
- 2. A 3 signal combination that has all numbers 0-9 and all letters of the alphabet
- 4. The science of light properties and behavior
- 5. A wave with a specific pattern that carries info
- 6. Used to transmit info from a remote control to a television
- 8. Allows all light to pass through
- 10. A signal that is not generated electronically