Soundproof walls

In todays lesson we reverberated the sound of 3 different places.The first place was our class room where we filmed a speach on the camera,the second place was the lift were we filmed another speech in a much small place. The last place was the stairwell which was a very big area.

Sound proof walls are made out of sponge and sorta look like egg cartons. The reason they are made out of sponge is because sponge absorbs all of the sound waves that hit into it.