Mini-"bell in a bell jar"

• Autores: Zhang Wei, Hou Jiali, Yang Wenfang
• Localización: The Physics Teacher, ISSN 0031-921X, Vol. 51, Nº. 1, 2013, pág. 53
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • A number of versions of the well-known �bell-in-a-bell-jar� demonstration have been discussed in this journal.1�3 The basic idea is that when a sound source is placed inside an air-tight container, the volume of the sound that's heard decreases dramatically when the container is evacuated. This phenomenon is primarily due to the mismatch that is created between the sound transducer and the surrounding medium.4,5 Here we describe a simple small-scale version of this demonstration, one that may be added to the growing list of examples of how a simple syringe may be used as a tool in physics teaching.6�8