Waves : Sound

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Across
  1. 5. a measure of sound intensity and amplitude.
  2. 6. the change in the direction of a wave passing from one medium to another caused by its change in speed; the bending of a wave.
  3. 8. the invisible mixture of gases that surrounds Earth.
  4. 9. the periodic back-and-forth movement of a wave.
Down
  1. 1. a vibration that begins as acoustic wave through a medium such as a gas, solid, or liquid.
  2. 2. a substance composed of chemical elements hydrogen and oxygen existing as a gas, solid, or liquid.
  3. 3. the characteristic of a sound that determines the shrillness; a description of the frequency of the sound wave.
  4. 4. a substance that transfers energy from one substance to another substance, from one place to another, or from one surface to another.
  5. 7. a change in the direction of a wave at an interface between two different media so that the wave returns to its starting point.