The Frequency At Which Sound Shatters Glass?

Question

What is it? anyone know? Details in Khz and Db would be dandy.
Furhtermore-any ideas on replicating this sound level (other than just screaming quite shrilly) would be fab.
Ok cool...
Merci.

Answer 1

depends on the shape of the glass....

it will be the resonant frequency of the particular drinking glass....
(it is not glass substance which shatters at a particular frequency, but the bowl of the drinking glass which starts to 'wobble' and flex more and more [resonance] until the glass substance can't hold itself together any more, and so shatters!)

I IMAGINE (but I can't prove it) that it would be the dominant frequency which you get when rubbing a wet finger round the edge of the particular glass.

To replicate the sound ideally, you need an oscilator and an amplifier....

Answer 2

The crystals of Crystal glass that make up the glass are constantly vibrating at a certain frequency.
The frequency of a sound wave above the frequency of the crystals will cause the vibrations within them to exceed the forces holding them together and the glass shatters.
Different types of crystal glass will have different frequencies and ordinary glass probably will not shatter.
A high frequency sound generator is required that can generate a resonance frequency at or above that of the crystals.

Answer 3

It's usually on the high end of the hearing range, but it depends on the glass. You have to hit a resonance frequency. Mythbusters did a show on it. They needed a big speaker and variable frequency generator.

Answer 4

Have a read at:
http://www.physlink.com/Education/AskExperts/ae232.cfm