Design and Construction of Sound Interference within Tube and Smartphone Application

Abstract

This article presents an audio interference test kit for designing and developing audio interference test kit that follows the theory of interference of sound by smartphone application (Hoel Boedec) which generates frequency of sound waves of 600-1200 Hz. The test kit made from PVC pipe was able to adjust the pipe length to study path difference between two waves. The test kit was tested for wavelength at room temperature by  observing the interference of the complementary sound through smartphone application (Advanced spectrum Analyzer PRO). At the frequency of 600-1200 Hz, frequency measurements from smartphones were 602, 710, 796, 904, 1000, 1100 and 1200 Hz. The average deviation was 7.2 percent. The destructive interference through the smartphone generated same frequency as the constructive interference indicated  an average error of 12.8 percent. The result showed that the frequency is inversely proportional to the wavelength. The cause of discrepancy may be due to non-release of specified frequency by the frequency generator. In addition, outside interference affecting the receiver results in inaccuracy. As mentioned above, wavelength is reduced when the frequency increases. Suggestions for this research is that the test kit can be used as a prototype in the physics laboratory by schools. Since various materials and equipment can be easily procured. Also, it is easy to create and provides  clear results.