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THE RISING INTONATION OF TAPPING COFFEE MUGS
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Jeroen_Sol
Nothing reveals Humanity so well as the games it plays. A game of betrayal, where the most suspicious person is brutally murdered? How savage.
3885
Jeroen_Sol
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CloseI'm wondering if there's any physicists here who can explain this phenomenon, because I'm breaking my head over it.
Whenever I stir my coffee into a circular motion, and then tap the bottom of my mug inside the coffee with a spoon, the sound it makes has a rising intonation. I can't seem to figure out why this happens. I've tested it several times, all with the same results.
- Both with ceramic and glass mugs, I can distinctly hear a rising intonation.
- As a sort of control test to see if hot water was the only requirement, I tried tea in a glass mug, but the phenonmenon didn't occur.
- When I've tried the experiment once, and stir the coffee a second time in the same cup, the tone resets and starts to rise again.
- The speed at which the tone rises is dependant on the speed of the tapping. If I tap more slowly, the tone also rises more slowly.
I have no idea what could be causing this kind of phenomenon. Perhaps someone here has some theories?
Whenever I stir my coffee into a circular motion, and then tap the bottom of my mug inside the coffee with a spoon, the sound it makes has a rising intonation. I can't seem to figure out why this happens. I've tested it several times, all with the same results.
- Both with ceramic and glass mugs, I can distinctly hear a rising intonation.
- As a sort of control test to see if hot water was the only requirement, I tried tea in a glass mug, but the phenonmenon didn't occur.
- When I've tried the experiment once, and stir the coffee a second time in the same cup, the tone resets and starts to rise again.
- The speed at which the tone rises is dependant on the speed of the tapping. If I tap more slowly, the tone also rises more slowly.
I have no idea what could be causing this kind of phenomenon. Perhaps someone here has some theories?
MajoracanKing
201
First, are you on any drugs? Heroine perhaps? Kidding, kidding.
I've never observed this myself, but now I have to try it.
I've never observed this myself, but now I have to try it.
Avee
5794
This is interesting. Honestly.
Ask these guys and let us know when they answer:
http://www.physicscentral.com/experiment/askaphysicist/question.cfm
Ask these guys and let us know when they answer:
http://www.physicscentral.com/experiment/askaphysicist/question.cfm
You certainly have the proper mindset for physics!
I may pass this question on, but I won't be able to answer it myself, sorry.
I may pass this question on, but I won't be able to answer it myself, sorry.
LockeZ
I'd really like to get rid of LockeZ. His play style is way too unpredictable. He's always like this too. If he ran a country, he'd just kill and imprison people at random until crime stopped.
5958
If it happens with coffee but not tea, and it resets if you start stirring again, my first guess would be that coffee bean particles (or the cream, if you take your coffee with cream) are settling on the bottom of the cup. This would change the density of the liquid directly surrounding the part of the cup you're tapping (the bottom), which would change the tone of the sound. Tapping a glass with a different density of liquid inside will produce a different sound.
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