Dra. Camila Francisca Marín Sepúlveda

Publicaciones

• Acoustic testing of the inverse-square law using the infrared signal of a remote control

  In this work, the inverse-square law has been tested for the electromagnetic radiation in the infrared range. As a point-source, a TV remote control has been used. The intensities registered by a solar cell plugged to a speaker have been measured acoustically by recording the sound produced by the infrared pulses. The recorded audio is edited to find the intensities for different distances between the remote control and the solar cell.

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• Acoustic determination of g by tracking a free-falling body using a smartphone as a ‘sonar’

  The gravitational constant is determined by tracking the movement of a free-falling body in an aluminium pipe. For this purpose, a smartphone is used to generate sound waves of a specific frequency and to simultaneously detect the sound wave resonances in the tube. The ability of smartphones to generate and receive the sound waves to track a moving body, like a ‘submarine SONAR’ does, is an essential point in this work.

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• Acoustic characterization of magnetic braking with a smartphone

  Smartphone sensors have shown to be adequate to perform physics experiments in high school and first-year university physics courses. The published work covers a wide range of topics within general physics such as linear and circular motions, oscillations, beats, acoustics, and optics, among others. The microphone and speakers have been particularly useful for studying sound phenomena, such as the determination of the speed of sound, the study of acoustic beats, or the Doppler effect.

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