Increase in the frequency of sound in a glass of water?

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SUMMARY

The discussion centers on the phenomenon of increased sound frequency when a spoon strikes the bottom of a glass of water. Participants highlight that the frequency increase is relative to the frequency of previous beats, emphasizing the need for controlled measurements to validate observations. The conversation also touches on how stirring liquids like tea or coffee can alter sound frequency due to changes in solute concentration and fluid dynamics, such as fluid level rising at the edges of the glass.

PREREQUISITES
  • Understanding of sound wave propagation in liquids
  • Basic principles of fluid dynamics
  • Knowledge of frequency measurement techniques
  • Familiarity with the effects of solutes on sound transmission
NEXT STEPS
  • Research sound wave behavior in different liquids
  • Learn about frequency measurement tools and techniques
  • Explore the impact of solutes on sound speed and frequency
  • Investigate fluid dynamics related to surface tension and fluid contact with solids
USEFUL FOR

Acoustics researchers, physicists, and anyone interested in the interaction between sound and fluid dynamics will benefit from this discussion.

SherLOCKed
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Suppose you have a glass of water, and you beat a spoon on the bottom layer of glass through the mouth of glass, repeated beatings in a regular fashion will cause in increased frequency of sound produced due to the spoon beating?What causes such increase in frequency?
 
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Increased relative to what? The individual beats should all be very similar.
 
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SherLOCKed said:
What causes such increase in frequency?
Did you measure that? How was the hitting controlled to be constant?
 
mfb said:
Increased relative to what? The individual beats should all be very similar.
The frequency increased relative to the frequency of previous beat.
 
A.T. said:
Did you measure that? How was the hitting controlled to be constant?
This was not done in controlled environment, this is something i have experienced and hence the result has been described qualitatively and not quantized.
 
Without some measurement (record it?) I don't see how this thread could lead to useful answers.
 
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The OP could be referring to at least two different effects...

In Tea and Coffee the note can sometimes change because stirring causes the amount of Tea, Coffee or sugar dissolved in the water to increase. And possibly reduce the amount of dissolved gasses

Stirring can also cause the fluid level to rise up at the edges so more of the fluid is in contact with the glass.
 
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