Resumo

TORRES-ZUNIGA, V.. How can acoustic resonance reduce the average velocity in a falling body?. Rev. mex. fís. E [online]. 2011, vol.57, n.1, pp.16-20. ISSN 1870-3542.

In this article, a simple experiment is described to overcome the misconception that acoustic pressure and levitation effects are difficult to observe in school laboratories. Analysis of the free fall velocity of a toy parachute inside a vertical tube, driven by sound in a range of frequencies aromid the resonant condition, exhibits the resonance frequency, the node pressure zones, and the optimal conditions to obtain acoustical levitation of a light body.

Palavras-chave : Resonant tube; acoustic pressure; high school demonstration.

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