The influence of bubbles on sound has long attracted the attention of physicists. In his 1920 book1 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.”2 In this paper we describe a simple and robust experiment that allows an easy audio and visual demonstration of the same effect (unfortunately without the chocolate) and offers several possibilities for student investigations. In addition to the demonstration of the above effect, the experiments described below provide an excellent opportunity for students to devise and test explanations with simple equipment.
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November 2012
PAPERS|
November 01 2012
Bubbles that Change the Speed of Sound
Gorazd Planinšič;
Eugenia Etkina
Eugenia Etkina
b)
Graduate School of Education,
Rutgers University
, New Brunswick, NJ
Search for other works by this author on:
a)
Gorazd Planinšič , Faculty for Mathematics and Physics, University of Ljubljana and The House of Experiments; [email protected]
b)
Eugenia Etkina, Graduate School of Education, Rutgers University, 10 Seminary Place, New Brunswick, NJ 08901; [email protected]
Phys. Teach. 50, 458–460 (2012)
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A correction has been published:
Correction: “Bubbles that Change the Speed of Sound” (Phys. Teach. 50, Nov. 2012)page 459
Citation
Gorazd Planinšič, Eugenia Etkina; Bubbles that Change the Speed of Sound. Phys. Teach. 1 November 2012; 50 (8): 458–460. https://doi.org/10.1119/1.4758141
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