Ch5 Crossword

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Across
  1. 2. absorb UV light and emit visible light
  2. 7. bending of a wave around an obstacle
  3. 10. the phenomenon of electric and magnetic fields interacting with each other
  4. 14. electromagnetic waves consisting of oscillating electric and magnetic fields travelling at the speed of light
  5. 16. number of waves produced each second and is measured in hertz
  6. 18. extremely high-frequency electromagnetic radiation emitted by radioactive materials
  7. 19. a region of electrical influence in which charged particles will move
  8. 23. a narrow tube of glass or plastic used to transmit pulses of light
  9. 26. cyan, yellow and magenta
  10. 27. the maximum distance a wave extends beyond its middle position
  11. 28. splitting of white light into separate colours
  12. 29. a continuous signal that varies in amplitude or frequency with the information being transmitted
  13. 30. electromagnetic radiation with wavelengths ranging from less than a centimetre to hundreds of kilometres, used in communication
  14. 31. a signal consisting of a series of ‘on’ or ‘off’ pulses
Down
  1. 1. a region of magnetic influence in which a magnetic object (like a compass) will move
  2. 3. the interaction of light with particles in the atmosphere, depending on colour and frequency of the light
  3. 4. electromagnetic radiation that is oscillating in a single plane
  4. 5. the range of colours that can be seen by the eye (red, orange, yellow, green, blue, indigo and violet)
  5. 6. the amount of data that can be transmitted through a communication channel
  6. 8. number system consisting only of two digits: 0 and 1
  7. 9. red, green and blue
  8. 11. the transfer of energy without transferring matter
  9. 12. high-frequency electromagnetic radiation that can penetrate materials
  10. 13. distance between two successive waves and is usually measured in metres
  11. 15. the entire range of frequencies of electromagnetic radiation, from high-frequency gamma rays to low-frequency radio waves
  12. 17. light waves that are ‘in step’
  13. 19. transverse electric and magnetic fields positioned at right angles to each other and travelling through empty space at the speed of light
  14. 20. filter, a transparent material that allows light of a particular colour to pass through
  15. 21. electromagnetic radiation with wavelengths ranging from fractions of a millimetre to tens of centimetres, used in communication and cooking
  16. 22. electromagnetic radiation with wavelengths slightly longer than those of visible light, detected by our skin as heat
  17. 24. a method of transmitting an internet signal using radio waves
  18. 25. electromagnetic radiation with frequencies just above those of visible light, contained in sunlight