Sound

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Across
  1. 2. Speed of sound in air is approximately 343 ____ per second (6 letters)
  2. 6. Material that reduces the amplitude of sound waves (8 letters)
  3. 7. Change in frequency of a sound wave relative to a moving source (8 letters)
  4. 9. Type of sound wave (12 letters)
  5. 10. Unit of sound intensity (7 letters)
Down
  1. 1. Repeated sound caused by reflection (4 letters)
  2. 3. Vibrational movement through air, water, or solids (5 letters)
  3. 4. Instrument for amplifying sound (9 letters)
  4. 5. Sound waves with frequencies above the human hearing range (10 letters)
  5. 8. Range of sound frequencies a human can hear (7 letters)