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Across 1. type of wave with a wavelength of 1cm 7. type of radiation at the highest frequency 9. the movement of a particle from its starting point and back 11. the maximum distance that a wave travels from its normal position 13. a signal that has two levels, 1 and 0 15. the ........................ spectrum is a group of waves that all travel the same speed through a vacuum 21. the number of wave oscillations in one second measured in Hertz (Hz) 23. a special type of reflection when a wave bounces back off the inside edge instead of refraction outwards 24. the mass of the unit volume of a material 26. type of radiation that give out heat 27. a signal sent out in the form of a wave

Down 2. the central source of an earthquake 3. a thin length of perspex or glass through which light is passed 4. a wave that oscillates parallel to the direction the wave travels, e.g. sound waves and p waves 5. a wave that can cause skin damage when sunbathing 6. when a wave bounces back off a material 8. when the DNA inside a cell is altered by radiation 10. the length of one wave from crest to crest or trough to trough 12. an earthquakes longitudinal wave 14. the way of identifying some one using the patterns and colours of the eye 16. high frequency waves that are ionising and used to produce images of bone damage 17. some of the energy of a wave is ................ into a material in which it is travelling 18. when a wave passes through a material and changes direction 19. a wave that oscillates at right angles to the direction the wave travels, e.g. water waves and s waves 20. high frequency sound waves that we can not hear but useful for baby scanners 22. sending out a wave 25. an earthquakes transverse wave