WAVES

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Across
  1. 2. the reduction of an item's density, the opposite of compression.
  2. 5. - time it takes something to happen
  3. 6. wave-a wave vibrating in the direction of propagation.
  4. 7. SI unit of length
  5. 12. International ( SI ) unit of time
  6. 13. - sensation of a frequency
  7. 15. - decrease in volume of any object or substance resulting from applied stress.
  8. 19. - lowest part of a wave
  9. 20. -phenomenon of increased amplitude that occurs when the frequency of an applied periodic force is equal.
Down
  1. 1. - the spreading of waves around polarization
  2. 3. - maximum amount of displacement of a particle on the medium from its rest position.
  3. 4. -unit for expressing the ratio between two physical quantities,
  4. 8. - the change in direction of a wave passing from one medium to another caused by its change in speed.
  5. 9. speed- speed at which wave travels
  6. 10. wave-a wave vibrating at right angles to the direction of its propagation.
  7. 11. wave- wave with a repeating continuous pattern which determines its wavelength and frequency.
  8. 14. - electromagnetic radiation that can be detected by the human eye.
  9. 16. wave -a wave that is not capable of transmitting its energy through a vacuum.
  10. 17. - mechanical disturbance from a state of equilibrium
  11. 18. - how loud or soft a sound seems to a listener.