Sound difraction through a door
Objectives & hypothesis
Our aim in this investigation is to measure the correlation between the opening of the door and the sound intenisty. Our hypothesis is that there is an amount of opening in the door where the intensity is at its peak.
Experiment variables
Experiment setup
A loudspeaker was positioned in the school playground facing a classroom, where a constant 880 Hz tone was played. Sound intensity within the classroom was measured using the Phyphox app, with the degree of door opening serving as the independent variable.
Safety precautions
Exposure to high-pitched, high-decibel sounds without protection can lead to temporary or permanent hearing damage, including tinnitus and noise-induced hearing loss; wearing noise-cancelling headphones can help protect your ears by reducing harmful sound levels.
Data analysis, evaluation and errors of the experiemnt
We repeated each test four times for accuracy. The stereo and listener didn’t move, and only the door opening changed. When the door was fully open, the intensity stayed around 59.4 dB, which helped us compare the rest. The RMSE of just 0.47 dB means the data didn’t vary much, and the error bars were small, so the results were solid.
Conclusion and improvements
There were things we couldn’t control and affected on the results. Phone mics aren’t perfect, and bushes and echoes might have changed how the sound moved. Also, tiny changes in how the phone was held could affect the results. If we did it again, we’d use more professional equipment and try it in a quieter space for more precise data.
As could be seen in the graphic our hypothesis was correct as there is an optimal amount of opening at 8,62 cm, at which the sound intensity is at 52,22 dB. Though it is less than when the door is completely open.
Sound diffraction through a door
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Created on April 29, 2025
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Transcript
Sound difraction through a door
Objectives & hypothesis
Our aim in this investigation is to measure the correlation between the opening of the door and the sound intenisty. Our hypothesis is that there is an amount of opening in the door where the intensity is at its peak.
Experiment variables
Experiment setup
A loudspeaker was positioned in the school playground facing a classroom, where a constant 880 Hz tone was played. Sound intensity within the classroom was measured using the Phyphox app, with the degree of door opening serving as the independent variable.
Safety precautions
Exposure to high-pitched, high-decibel sounds without protection can lead to temporary or permanent hearing damage, including tinnitus and noise-induced hearing loss; wearing noise-cancelling headphones can help protect your ears by reducing harmful sound levels.
Data analysis, evaluation and errors of the experiemnt
We repeated each test four times for accuracy. The stereo and listener didn’t move, and only the door opening changed. When the door was fully open, the intensity stayed around 59.4 dB, which helped us compare the rest. The RMSE of just 0.47 dB means the data didn’t vary much, and the error bars were small, so the results were solid.
Conclusion and improvements
There were things we couldn’t control and affected on the results. Phone mics aren’t perfect, and bushes and echoes might have changed how the sound moved. Also, tiny changes in how the phone was held could affect the results. If we did it again, we’d use more professional equipment and try it in a quieter space for more precise data.
As could be seen in the graphic our hypothesis was correct as there is an optimal amount of opening at 8,62 cm, at which the sound intensity is at 52,22 dB. Though it is less than when the door is completely open.