"Extreme Sounds by Tarissa and Sabrina," DragonflyTV, Twin Cities Public Television. In Experiment 2, what effect did increasing the distance have on your decibel readings? In this sense, the sound power is the cause and the sound … REGULAR LOGGING OF THESE TWO PARAMETERS PROVIDES EARLY WARNING OF BREAKDOWNSound Level Meter. Take three one-minute recordings at each location, and write down the average, min, and max decibel values. You might describe a sound as “quiet as a whisper” or “louder than a jet engine,” but you probably wouldn’t use a number. This is technically known as the inverse square law. 60 dB: normal conversation On the other hand, how loud is too loud for our ears? "Extreme Sounds: Lessons in a Noisy World.". Repeat the experiment with head phones if you have them. Changes over time: take readings of the same location at different hours and/or over several days. You can find this page online at: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Phys_p034/physics/extreme-sounds. You can download the app from, TPT, 2007. How does the decibel level change as you get farther away? The loudness, or intensity of sound is described in relative units called decibels (abbreviated dB), named after the American inventor of the phonograph and telephone Alexander Graham Bell. Did any of them have average decibel levels within an acceptable range, but maximum values that could cause temporary or permanent damage? You also might be interested in figuring out what causes "ringing in the ears" and if that is an indication of permanent hearing loss or not. Does the graph match what you would expect from the inverse square law? Music and videos are not a good source of sound for this experiment since their volume can fluctuate. Do you see any changes in the decibel readings? Take sound meter readings starting at the lowest volume level and continue to take readings at each interval indicated on the equipment by numbers, bars, etc. There are plenty of free options available, but some apps may have ads or in-app purchases enabled. Read on to see how you can repeat a similar experiment in your city or town and find out if, you too, have some acoustical surprises in your environment. Do not try to measure very loud noises (lawnmowers, chainsaws, concerts, etc.) Audacity: A general-purpose sound-editing program that you can also use for crude sound … Compared to a typical science class, please tell us how much you learned doing this project. Too high a pressure and prolong exposure will cause hearing damage and stress. Repeat the measurements at 2, 4, 8, and 10 meters away from the speaker. A sound source radiates power and these results in a sound pressure. The loudest? Sample Size: How Many Survey Participants Do I Need? Why do some sounds lead to permanent damage and others do not? What is a Bel, a decibel and what are the decibel levels of some common sounds and sites? Human screams can be quite loud, possibly exceeding 100 dB (as of March 2019, the world record is 129 dB! We recognize technology is now more widely available than it was when we began this series in 2011 and that it can add value to scientific exploration. That is about the loudest sound level our ears can take at close range, although anything over 120 dB can start to cause pain and potential damage. You will have a chance to experiment with the effect of distance on sound in one of the experiments in this project. If you purchased a standalone decibel meter, read the instructions that came with your meter. (2020, November 20). Which locations registered levels that could be associated with temporary hearing loss? Proceeds from the affiliate programs help support Now explore your own voice. Even in a perfectly “quiet” room background noises, such as the hum of a computer or even your own breathing, could make it hard to get below about 10 dB. Since the sound levels for this part of the experiment should be more constant, you can record for a shorter period of time, like 5 or 10 seconds, and measure the average value. Make a graph of the average decibel level vs. distance. STEM Activities for Kids, from Science Buddies, This activity brought to you in partnership with Science Buddies. If you have any comments (positive or negative) related to purchases you've made for science projects from recommendations on our site, please let us know. Search for a website or app that will let you play sound at a constant volume, like white noise or a tone generator. Be careful not to talk or make any loud noises while you are holding the phone and recording, as this will affect your data. Is there any difference between the sound levels at each interval from the speaker versus from the head phones? People who will be very close to a consistently loud sound all day (such as someone who mows lawns or works near jet engines for a living) should wear hearing protection. Science Buddies participates in affiliate programs with You may print and distribute up to 200 copies of this document annually, at no charge, for personal and classroom educational use. Home Science Tools, Measurement Background Key concepts Make sure the device's volume stays constant throughout all your trials.

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