Why Do Glasses and Lightbulbs Spontaneously Explode on My Desk?

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    Glass Phenomenon
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SUMMARY

The discussion centers on the spontaneous explosion of glass and lightbulbs placed on a desk between a computer monitor and speakers. Users suggest that ultrasonic acoustic energy emitted by malfunctioning monitors, particularly in the frequency range of 15-35 kHz, may cause glass to resonate and break. The phenomenon of spontaneous glass breakage is also referenced, indicating that improperly annealed glass can shatter without apparent cause. Participants recommend conducting experiments to identify the source of vibrations and acoustic emissions to confirm the cause of the breakage.

PREREQUISITES
  • Understanding of ultrasonic frequencies and their effects on materials
  • Basic knowledge of glass properties, including tempering and annealing
  • Familiarity with audio recording software, specifically Audacity
  • Knowledge of monitor operation, particularly CRT technology and its electromagnetic emissions
NEXT STEPS
  • Research the effects of ultrasonic frequencies on glass materials
  • Learn about the properties and manufacturing processes of tempered vs. annealed glass
  • Explore the use of Audacity for recording and analyzing sound frequencies
  • Investigate the electromagnetic emissions of CRT monitors and their potential impact on nearby objects
USEFUL FOR

This discussion is beneficial for physicists, materials scientists, audio engineers, and anyone experiencing unexplained breakage of glass items in proximity to electronic devices.

  • #31
michojek said:
lol its an LED.

but funny, i actually got it repaired a month ago.. because of power failure..

ist this 'leaking frequency' a health hazard?

Maybe—if you're a bat. :-p
 
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  • #32
mfb said:
Quick question: You are all assuming that michojek uses a CRT monitor? They are quite rare today.

Delaminated transformers make high pitched noises. Eventually ultra sound? Might there be one in the speakers or even in a non-CRT monitor? But quite frankly I doubt this could cause glass to break.
 
  • #33
A.T. said:
Delaminated transformers make high pitched noises. Eventually ultra sound? Might there be one in the speakers or even in a non-CRT monitor? But quite frankly I doubt this could cause glass to break.
Ferrite cores as used in high-frequency switching power supplies exhibit magnetostriction, so can be a generator of high-pitched sound.
 
  • #34
How often did this happen?
 

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