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fisicasound
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Sound attenuation
for my physics project I decided to investigate sound attenuation effect, for my equipment I’m using a speaker with a signal generator and at the other end a microphone with an oscilloscope...the sound generator and receiver were placed inside a tube which was well insulated to prevent the apparatus resonance(but i still get a resonance effect and I don’t know if it will affect my results)...also the apparatus is designed so I could insert different materials and different thicknesses in between the receiver and speaker
I was wondering if anyone could answer the following questions.
1. to show my results in dB i must find the sound intensity in W/m^-2...is it the same as the peak to peak voltage readings in my oscilloscope
2. What type of materials should I be looking for that can be easily accessible?
I was thinking of polystyrene, also what properties in a material make it good for sound insulation?
3. To plot graphs I was thinking of using the equation lnI= lnIo - μx where μ is the materials coefficient of attenuation and x is the thickness of the insulation...for the graph I was advised to vary x keeping the frequency constant but I don’t really know what frequency I will chose since humans have can hear a really big range of frequencies.. will the second graph for the same material vary μ as I change frequency
if u have any suggestions for any other experiment suggesting sound attenuation ill be glad to hear it
Thanks
for my physics project I decided to investigate sound attenuation effect, for my equipment I’m using a speaker with a signal generator and at the other end a microphone with an oscilloscope...the sound generator and receiver were placed inside a tube which was well insulated to prevent the apparatus resonance(but i still get a resonance effect and I don’t know if it will affect my results)...also the apparatus is designed so I could insert different materials and different thicknesses in between the receiver and speaker
I was wondering if anyone could answer the following questions.
1. to show my results in dB i must find the sound intensity in W/m^-2...is it the same as the peak to peak voltage readings in my oscilloscope
2. What type of materials should I be looking for that can be easily accessible?
I was thinking of polystyrene, also what properties in a material make it good for sound insulation?
3. To plot graphs I was thinking of using the equation lnI= lnIo - μx where μ is the materials coefficient of attenuation and x is the thickness of the insulation...for the graph I was advised to vary x keeping the frequency constant but I don’t really know what frequency I will chose since humans have can hear a really big range of frequencies.. will the second graph for the same material vary μ as I change frequency
if u have any suggestions for any other experiment suggesting sound attenuation ill be glad to hear it
Thanks