Bubbles That Change the Speed of Sound

Autor/inn/en	Planinsic, Gorazd; Etkina, Eugenia
Titel	Bubbles That Change the Speed of Sound
Quelle	In: Physics Teacher, 50 (2012) 8, S.458-460 (3 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0031-921X
DOI	10.1119/1.4758141
Schlagwörter	Physics; Acoustics; Science Instruction; Science Experiments; Scientific Principles; Demonstrations (Educational) + Suchen Sie Ihr Suchwort? Physik; Akustik; Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Demonstrationsexperiment; Demonstrationsmodell; Demonstrationsunterricht
Abstract	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." 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. (Contains 1 table and 3 figures.) (As Provided).
Anmerkungen	American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail: pubs@aapt.org; Web site: http://scitation.aip.org/tpt
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10