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

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Discussion Overview

The discussion revolves around the phenomenon of sound frequency changes when a spoon beats on the bottom of a glass of water. Participants explore the causes of perceived frequency increases and the conditions under which these observations occur, focusing on qualitative experiences rather than quantitative measurements.

Discussion Character

  • Exploratory
  • Debate/contested

Main Points Raised

  • Some participants question what the frequency increase is relative to, suggesting that individual beats should be similar.
  • There is a call for clarification on how the hitting was controlled and whether any measurements were taken to substantiate the claims of frequency increase.
  • One participant mentions that the frequency increase is relative to previous beats, indicating a subjective experience rather than an objective measurement.
  • Another participant suggests that the change in sound frequency could be influenced by factors such as the amount of dissolved substances in the water or the fluid level in contact with the glass.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the nature of the frequency increase, with multiple competing views regarding the causes and the need for measurement. The discussion remains unresolved.

Contextual Notes

Limitations include the lack of controlled experimental conditions and the absence of quantitative data to support claims about frequency changes.

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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