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This needs one. — Preceding unsigned comment added by 71.237.150.151 ( talk) 18:49, 26 January 2014 (UTC) reply

I am no expert but this part seems incorrect.

"Acoustic attenuation in water is frequency-squared dependent, namely ${\displaystyle \eta =2}$. Acoustic attenuation in many metals and crystalline materials is frequency-independent, namely ${\displaystyle \eta =1}$. ^[1]"

${\displaystyle \eta =1}$ means the characteristic length is ${\displaystyle 1/\alpha _{0}\omega }$, yet the source (which seems to have incorrect syntax as well) claims it's frequency independent. Someone who knows this check if the statement is valid. 59.115.129.173 ( talk) 18:58, 27 February 2024 (UTC) reply