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