Development of Sound Wave Experimentation Tools Which Influenced by Relative Humidity Using Audacity

Abstract

The development of experimental tools is important for teachers to assist in the learning process of physics. The purpose research is to develop a sound wave experiment tool that is influenced by relative humidity. The experiment tool was made using a closed and open end PVC tube with a length of 142 cm. Relative humidity obtained is boiling water vapor. Water vapor is entered the PVC tube and the relative humidity level is measured in the tube using a hygrometer. The experiment tool is equipped with audacity software to detect and display sound waves which enter PVC tube. The experimental results are viewed through a graph of sound velocity against relative humidity levels in the tube. When the temperature is 29°C the relative humidity value is 86% with a sound speed of 412 ms-1 and measurement error of 2.01%. The conclusion is the speed of sound increases linearly with increasing relative humidity.