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Posted
  On 8/11/2018 at 8:37 AM, someguy55 said:

How loud, in dB, is shattering glass (a cup or window) at 1m?

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Depends on the size, thickness and type of glass, how it is mounted/supported, how and where it is broken, and ...

Posted
  On 8/11/2018 at 11:30 AM, Strange said:

Depends on the size, thickness and type of glass, how it is mounted/supported, how and where it is broken, and ...

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....whether there is echo in closed room, constructive/destructive interference after reflection in exact point where is microphone..

etc. etc.

 

Therefore experiments with sound are performed in "noiseless rooms" (aka "Anechoic chamber")

https://en.wikipedia.org/wiki/Anechoic_chamber

 

Posted

Yes, but I only need an approximate/inexact value - so I can use it as a reference point against the volume of glass shattering in general

Posted
  On 8/11/2018 at 12:02 PM, someguy55 said:

Yes, but I only need an approximate/inexact value - so I can use it as a reference point against the volume of glass shattering in general

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i don't think you can. A breaking cup sounds different to a pane of glass. The pane can briefly act like a drum skin and can push air like one, giving a lower frequency component than say a cup. What you are effectively asking is "How long is a piece of string?"

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