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

[SherLOCKed]

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?

 

[mfb]

Increased relative to what? The individual beats should all be very similar.

 

[A.T.]

What causes such increase in frequency?

Did you measure that? How was the hitting controlled to be constant?

 

[SherLOCKed]

Increased relative to what? The individual beats should all be very similar.

The frequency increased relative to the frequency of previous beat.

 

[SherLOCKed]

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.

 

[mfb]

Without some measurement (record it?) I don't see how this thread could lead to useful answers.

 

[CWatters]

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.