waves

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Across
  1. 3. change in the speed of light as it passes from one substance into another
  2. 5. curved outwards
  3. 6. high energy electromagnetic waves that can be transmitted through solids and provide infomation about their structure
  4. 7. allowing light tp come through imperfectly as in frosted glass
  5. 12. high energy electromatic radiation produced during nuclear reactions
  6. 14. narrow beams of light
  7. 15. transmitter of energy without the movement of particles from place to place
  8. 16. material through which a wave moves
  9. 18. region in which the particels are closer than when not disturbed by a wave
  10. 19. unit of frequency
Down
  1. 1. curved inwards
  2. 2. bouncing off the surface of a substance
  3. 4. invisible radiation emitted by all warm objects
  4. 7. discribes a substance that allows most light to pass throught it
  5. 8. maximum distance that a particle moves away from its undisturbed position
  6. 9. invisible radiation similer to light but with a slightly higher frequency and more energy
  7. 10. describes a substance that does not allow any light to pass through it
  8. 11. wave involving the vibration of particles perpendicular to the direction of energy transfer
  9. 13. wide stream of light rays all moving the same direction
  10. 17. a unit of measurement of relative sound intensity