| LC control no. | sh 85139494 |
|---|---|
| LC classification | QC244 Acoustics TA367 Engineering |
| Topical heading | Ultrasonics |
| Variant(s) | Inaudible sound Supersonics |
| See also | Sound Sound pressure |
| Scope note | Here are entered works on sound inaudible to the human ear, i.e., at frequencies above about 20,000 cycles. |
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