Aplicação do smartphone intermediado pelo aplicativo ArduinoScience Journal para determinar a velocidade do som no ar utilizando tubos sonoros

Abstract

Smartphones are one of humanity's significant evolutions. In recent years, these devices have become accessible and popular due to their ease of communication. Moreover, they are part of Digital Information and Communication Technologies (DICT). However, the lack of digital literacy prevents these devices from being employed to their fullest extent. In this scenario, we present a work aimed at developing an experimental methodology to develop an educational product that uses the smartphone mediated by the Arduino Science Journal application to perform studies on standing waves and determine the speed of the sound using open-end sound tubes. We used Plastic cold water tubes to determine the speed of the sound, and the methodology employed was divided into two stages. In the first, an audio recorder installed on a computer captured the sound pulses. In the second stage, we used a smartphone and the Arduino Science Journal app's frequency meter to measure the frequency of the pulses. In both steps. We hit with a hand to produce sound pulses and make the tubes assume the behavior of open-end sound tubes. We calculated The speed of the sound by equations for predicting normal vibration modes in open-end sound tubes. For data analysis, the Fast Fourier Transform (FFT) was used to obtain the frequency spectra of the sound pulses obtained in the first step. Then we identified which frequency peak corresponded to the frequency measured by the smartphone. Results showed that the frequency measured by the device always corresponds to the first peak of the frequency spectrum, which is associated with the first harmonic. According to the methodology adopted, the speed of the sound obtained was equivalent to those reported in the literature. This information enabled us to produce an educational product following Ausubel's concepts of meaningful learning and put it into practice in second-year high school classes in Campina da Lagoa – PR. The questionnaires showed that the students had some knowledge of wave theory. Moreover, the proposed work methodology enhanced the absorption of new concepts of Physics related to the theme. The present proposal was created as part of the requirements for a master's degree defense and added another benefit to Brazilian education.