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- W2037447890 abstract "An empty coffee cup, like an ancient Chinese two-tone bell, emits two distinctly different tones, depending upon where it is tapped. When it is filled with hot water, and some instant coffee is added, however, a whole new set of sounds is heard when the cup is tapped. The pitch rises an octave or more as the foam clears due to the dramatic change in the speed of sound in the bubble-filled liquid. A similar, but smaller, effect was noted in beer by Bragg [The World of Sound (1968)] and in hot chocolate by Crawford [Am. J. Phys. (1982)]. We describe the modes of vibration in a coffee cup and the sound emitted by a coffee cup as filled with instant coffee as the bubble density changes." @default.
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- W2037447890 date "2002-05-01" @default.
- W2037447890 modified "2023-09-24" @default.
- W2037447890 title "Sound of a cup with and without instant coffee" @default.
- W2037447890 doi "https://doi.org/10.1121/1.4778143" @default.
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