“…The output of the recording using Audacity is in the form of audio files, either .wav, .aiff or .mp3 [9]. Audacity also functions to analyze the frequency of the recorded signal, search for the largest frequency record and record/detect EMF (Electromagnetic Field) signals [14][15][16][17][18]. Many experiments the data of which can be collected using Audacity, such as measuring Earth's gravitational acceleration [14], studying the Doppler effect [10], measuring the speed of sound [13], comparing the effects of factors in electromagnetic induction [15], experimenting resonance tube [11], and so on.…”