Across
- 2. Matter that allows some light to pass through
- 3. Used to transmit information from a remote control to a television
- 5. The science of light properties and behavior
- 6. Matter that does allow light to pass through
- 7. Matter That allows light to pass through
- 9. A wave with a specific pattern that carries information
- 10. The region where light is obstructed or blocked
- 12. Used to transmit television and radio programs
Down
- 1. a unique 3-signal combination of dashes and dots codes for each letters of the alphabet and numbers 0 to 9
- 4. Wave signals generated electronically from digital information
- 8. Wave signal not created by digital information
- 11. Used to transmit information between cellphones or between an internet router and a computer