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Bubbles That Change the Speed of Sound
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Planinsic, Gorazd; Etkina, Eugenia – Physics Teacher, 2012
The influence of bubbles on sound has long attracted the attention of physicists. In his 1920 book Sir William Bragg described sound absorption caused by foam in a glass of beer tapped by a spoon. Frank S. Crawford described and analyzed the change in the pitch of sound in a similar experiment and named the phenomenon the "hot chocolate effect."…
Descriptors: Physics, Acoustics, Science Instruction, Science Experiments