Monitoring Noise Levels with a Smart Device
This sound monitoring setup is collecting data on construction noise near a school.
Students learn the physical properties of sound, how it travels and how noise impacts human health—including the quality of student learning. They learn different techniques that engineers use in industry to monitor noise level exposure and then put their knowledge to work by using a smart phone noise meter app to measure the noise level at an area of interest, such as busy roadways near the school. They devise an experimental procedure to measure sound levels in their classroom, at the source of loud noise (such as a busy road or construction site), and in between. Teams collect data using smart phones/tablets, microphones and noise apps. They calculate wave properties, including frequency, wavelength and amplitude. A PowerPoint® presentation, three worksheets and a quiz are provided.
Many engineers are concerned with noise and its potential to impact human health. Engineers who oversee construction projects make sure that the work does not generate unacceptable noise levels for workers and nearby residents. Engineers who design new equipment make sure that machine noise levels do not exceed designated standards. For example, a power generator may have been designed with acceptable noise levels, but if installed too close to residences, could be considered too loud. Ways to fix the situation include modifying the generator to reduce its noise output, building a noise reduction wall or relocating the generator.
After this activity, students should be able to:
- Calculate the frequency, wavelength and amplitude of waves.
- Describe how sound travels through various media.
- Explain the difference between sound and noise.
- Devise an experimental procedure to collect data.
- Analyze collected data and draw conclusions.
- Determine unhealthy noise levels.