Xnader's Light Waves Vocab

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