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Materials Science Science Fair Project

Sound Transmission: A Science Project

Sound Transmission: A Science Project | Science Fair Projects | STEM Projects
Ever wonder how sound travels? In this project, you'll explore how the density of a material affects how much sound it transmits. You'll measure the noise level of a siren outside and inside a box with different materials of varying densities.


The hypothesis is that higher density materials will transmit less sound.

Method & Materials

You will make a box and place a siren inside it. You will measure the noise level outside the box with a decibel meter. Then you will replace the material on the front side of the box with different materials of varying densities and measure the noise level outside the box again.
You will need a decibel meter, a battery operated siren, a 300mm x 300mm x 300mm plywood box, a 250mm x 250mm piece of plywood, a 250mm x 250mm bakelite, a 250mm x 250mm sheet of glass, a 250mm x 250mm marble tile, and a ruler.


The results showed that the higher density materials of glass and marble tile had the lowest noise level and plywood, the lowest density material, had the highest noise level recorded by the decibel meter. This proves that higher density materials are very good sound barriers.

Why do this project?

This science project is interesting because it explores how sound travels and how the density of a material affects how much sound it transmits.

Also Consider

Experiment variations include comparing different elastic materials like rubber and metal, and repeating the experiment with different sources of sound like a portable CD player.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related videos

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