Waves

3. - time it takes something to happen
6. - the change in direction of a wave passing from one medium to another caused by its change in speed.
7. wave- wave with a repeating continuous pattern which determines its wavelength and frequency.
8. wave-a wave vibrating in the direction of propagation.
10. - sensation of a frequency
12. - mechanical disturbance from a state of equilibrium
15. the reduction of an item's density, the opposite of compression.
17. wave -a wave that is not capable of transmitting its energy through a vacuum.
19. speed- speed at which wave travels
20. SI unit of length

1. - decrease in volume of any object or substance resulting from applied stress.
2. -phenomenon of increased amplitude that occurs when the frequency of an applied periodic force is equal.
4. International ( SI ) unit of time
5. - maximum amount of displacement of a particle on the medium from its rest position.
9. - the spreading of waves around polarization
11. lowest part of a wave
13. - electromagnetic radiation that can be detected by the human eye.
14. wave-a wave vibrating at right angles to the direction of its propagation.
16. -unit for expressing the ratio between two physical quantities,
18. - how loud or soft a sound seems to a listener.