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| The ratio of the mass of a substance to its volume (mass divided by volume) |
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| A description of how sound is perceived as high or low |
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| Perception of the energy of a sound |
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| The amount of energy per second carried through a unit area by a wave |
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| A unit used to compare the loudness of different sounds |
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| The change in frequency of a wave as its source moves in relation to an observer |
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| A set of sounds or notes combined in ways that are pleasing |
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| The lowest natural frequency of an object |
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| A natural frequency that is a multiple of the fundamental tone's frequency |
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| A narrow region leading from the outside of the human ear to the eardrum |
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| The small, tightly stretched drum like membrane that separates the outer ear from the middle ear, and that vibrates when sound waves strike it |
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| A snail-shaped tube in the inner ear that is lined with receptor cells that respond to sound |
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| The use of reflected sound waves to determine distances or to locate objects |
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| Sound waves with natural frequencies above 20,000 Hz. |
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| A system that uses reflected sound waves to locate and determine the distance to objects under water |
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| An image formed using reflected ultrasound waves |
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