SOUND WAVES

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Across
  1. 1. _illiam _ertz, electronic by sound
  2. 2. the distance that a point on a wave travels per unit of time
  3. 5. highness or lowness of sound
  4. 7. stretch of time
  5. 8. _lexander _raham Bell,telephone
  6. 9. intensity of sound
  7. 11. synonym of solid
  8. 12. _ _ _ _ _m, it is an empty space
  9. 13. _ _ _ _ _sity
  10. 15. firm sound can be produced in a _____
Down
  1. 1. it is formed when a sound is made and that moves through the air and carries the sound to your ear
  2. 3. way of bats to find their way
  3. 4. decibel (abbr) unit in which the intensity of sound is measured
  4. 5. denotes the particular point in the cycle of a waveform
  5. 6. a matter for which sound should travel or propagate
  6. 10. best transmitter of waves
  7. 14. the repetition of a sound caused by reflection of sound waves