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Across 3. wavelengths we can see 7. when some of the wave energy is transferred to the material it travels through 10. the distance between two points in a wave (e.g. peak to peak) 12. a fibre that is used to send messages as light 13. a wave that oscillates at right angles to the direction of travel 15. giving out or sending out waves 16. wavelengths longer than 0.001nm used to sterilise equipment 17. the increase in size of a wave 19. wavelengths of 100nm used for tanning 20. the change in speed of a wave as it passes from one material to the next 23. a longitudinal wave produced by an earthquake 26. a signal which had two levels of states 27. wavelengths of 0.01mm used as heating 28. when waves pass into a material 29. when DNA in cells is altered by specific types of radiatio 31. To knock electrons out of atoms - happens in shortwave radiation 32. the source of an earthquake 33. energy tranferred from a point

Down 1. a wave that oscillates parallel to the direction of travel 2. a transverse wave produced by and earthquake 4. the whole spectrum ranging from radiowaves to gamma waves 5. wavelengths of 1m to 1km used for communication 6. wavelengths of 1cm used to heat objects 8. a type of wave produced in an earthquake 9. when a wave bounces back off a material 11. the complete movement of a wave particle from starting point and back 14. wavelengths of 0.001nm used to check for broken bones 18. a signal sent in the form of waves 21. the maximum distance of particles in a wave from their normal positions 22. calculated by dividing distance by time taken to travel 24. high frequency sound waves that we can not hear 25. the number of wave oscillations in one second 30. the mass of a unit of volume of material