Measurement of speed of sound in air using Lissajous curves

Authors

Jenny Lou B. Sagisi ⋅ PH National Institute of Physics, University of the Philippines Diliman
Rommil B. Emperado ⋅ PH National Institute of Physics, University of the Philippines Diliman
Wilson O. Garcia ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

Lissajous figures were used to monitor the relative phase of two sinusoidal signals from a speaker-microphone system. From the phase variation due to microphone position, the wavelength was measured. We obtained wavelengths of different signals with known frequencies and determined the speed from the linear plot of wavelength and period. Our experimental value is 348.2 ± 2.4 m/s which deviates from our reference value by only 0.58 %. Our setup is suitable for speed of sound measurement in an undergraduate physics laboratory.

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Issue

2016: Proceedings of the 34th Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2016-PA-12

Section

Poster Session PA

Published

2016-08-18

How to Cite

[1]

JLB Sagisi, RB Emperado, and WO Garcia, Measurement of speed of sound in air using Lissajous curves, Proceedings of the Samahang Pisika ng Pilipinas 34, SPP-2016-PA-12 (2016). URL: https://proceedings.spp-online.org/article/view/SPP-2016-PA-12.