Why would more sound travel through two materials than one alone?

Subject: Why would more sound travel through two materials than one alone?

Date: Wed Nov 15 12:59:48 2006
Posted by Ian B.
Grade level: 7-9 School: New Community School
City: Richmond State/Province: Va Country: United States
Area of science: Physics
ID: 1163620788.Ph

Message:


In a school science experiment, I lined a 3/4" plywood box with 1" styrofoam 
inside, put a speaker inside sealed the box and measured sound in dB using a 
microphone 4" away from the outside of the box.  More sound registered wihen I 
used the styrofoam inside the box, than just the plywood box itself.  Can you 
explain this.  Does styrofoam amplfy certain ranges of sound???

Re: Why would more sound travel through two materials than one alone?

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