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

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.

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

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.

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!