Waves

3. narrow beams of light.
5. region in which the particles are closer than when not disturbed by a wave.
7. cured outwards.
9. change in the speed of light as it passes from one substance into another.
12. high energy electromagnectic waves that can be transmitted though solids and provid information about their structure.
14. a unit of measurement of relative sound intensity.
15. transmitter of energy without the movement of particles from place to place.

1. bouncing off the surface of a substance.
2. wave involing th vibration of particles perpendicular to the direction of energy transfer.
4. curved inwards.
6. unit of frequency its abbreviation is Hz.
8. material through which a waves moves.
10. maximum distance that a particle moves away from its undisturbed position.
11. invisible radiation emitted by all warm objects.
13. wide stream of light rays,all moving in the same direction.