Unit 3. Electronic Engineering

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Across
  1. 2. the region in which a particular condition prevails
  2. 3. of colours that can be seen by humans
  3. 4. the set of colours into which a beam of light can be separated, or a range of
  4. 7. as light waves or radio waves
  5. 10. based on random choice or personal whim, rather than any reason or system
  6. 12. a minute portion of matter
  7. 15. a particle representing a quantum of light or other electromagnetic radiation,
  8. 16. to send out a beam, noise, smell or gas
  9. 17. any electronic device that changes one form of energy into another, such as a
  10. 18. and rope
Down
  1. 1. which changes sound waves into electrical signals
  2. 5. the pattern in which some types of energy, such as sound, light and heat, are
  3. 6. energy from heat or light that you cannot see
  4. 8. energy proportional to the radiation frequency but having zero rest mass
  5. 9. threads when they are in a mass that can be used for making products such as
  6. 11. energy from heat or light that you cannot see
  7. 13. or carried
  8. 14. having a wavelength which is after the violet (= light purple) end of the