Voice shattering Glass
I would like to know what exactly causes glass to shatter
when a singer shatters glass with their voice. Why must a certain pitch be
sung? And why does the pitch have to be held for a few seconds?
When the pitch (frequency) of the voice matches the natural frequency of
the glass, such large amplitude waves build up in the glass that it
shatters. This phenomenon is called resonance. It is what made the
original Tacoma Narrows Bridge collapse.
---Nathan A. Unterman
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Update: June 2012