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Por que a percussão de uma mola produz o mesmo som de “pistolas laser” do filme Star Wars?

2014; UNIVERSIDADE FEDERAL DE SANTA CATARINA; Volume: 31; Issue: 2 Linguagem: Inglês

10.5007/2175-7941.2014v31n2p385

ISSN

2175-7941

Autores

Jair Lúcio Prados Ribeiro,

Tópico(s)

Education and Digital Technologies

Resumo

When a stretched metal spring is hit sideways, a whistler is produced. The whistler is a sound effect that has become part of today's culture due to its popularity as the sound of a "laser gun" in the movie Star Wars. The whistler occurs due to sound dispersion in the metal, but the revision of High School textbooks and University education shows that a discussion of this phenomenon is not present. We present an experimental activity that can be conducted in High School, in order to detect the whistler and analyze it with a sound editing program. The graphical analysis allowed us to approximately determine that the frequency of propagating sound and its time detection are inversely related.

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