Using Pendulum Oscillation as Doppler Effect Experiment A Y Nuryantini (a), R Zakwandi (b), M. A. Ariayuda (c)
(a) Physics Education Department, Faculty of Tarbiyah and Teacher Training, UIN Sunan Gunung Djati, Bandung, Indonesia
(b) Master Program of Physics Education, Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta, Yogyakarta, Indonesia
(c) Mechanical Engineering Department, Faculty of Engineering, Universitas Diponegoro, Semarang, Indonesia
Abstract
The study of the Doppler effect was quite difficult to demonstrate quantitatively. In this study, the researcher provides a simple experiment using a smartphone to demonstrate the Doppler effect by designing a pendulum oscillation experiment. This experiment design to prove the Doppler effect equation in which correlation between frequency and velocity. The experiment was designed as a pendulum oscillation experiment and a smartphone as the detector. The pendulum implanted sound sources were oscillated to gain the velocity and the smartphone was placed in the middle (equilibrium point) to record frequency change. The experimental result shows that the frequency detected was increasing when the pendulum moves closer to the equilibrium point and decreasing when the pendulum moves away from the equilibrium point. Experimental accuracy using smartphone sensor was shown by R-square in which infit with the model that is 0.8998 for move closer pendulum and 0.8187 for move away pendulum. The experiment can thus be used to assist high school students and physics undergraduates in understanding the Doppler effect with a simple and low-cost experiment.
