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Across 3. shortest wavelength and highest frequencies 6. light rays bounce off the surface at an angle 8. this is the distance between any point on a wave and the equivalent point on the next 9. its the glass in a telescope 11. when light cause into a surface slows down then speeds up when it exits a surface 14. surfaces that take in the light without reflecting it 15. the____ of the waves is measured in metres per second 17. are the negative charged tiny particles that orbit an atom 19. when a surface changes the direction of the light 20. hard surfaces that reflect sound can cause_____

Down 1. rays given off when fast movinh electrons lose energy very quickly 2. very hot objects emit this type of radiation 4. to and fro movements of a wave 5. the number of waves passing any point per second 7. pictures created by millions of tiny cells that light up in different combinations 10. when a grill or heater turns on you can see this radiation being emitted 12. this is the maximum distance a point moves from its rest position when a wave passes 13. when white light splits into a ______ 16. turns incoming information into a for which can be transmitted 18. is the center part of an atom