If you were trying to build a soundproof room, which of the following materials would you choose in order to absorb the most sound, based on the coefficient of absorption for each material?
a. wood
b. concrete
c. heavy curtains
d. carpet
i'm thinking wood to absorb sound but i'm also thinking concrete to block it. but wouldn't that make it echo?

Coefficients of Absorption for Common Materials

Perforated acoustic ceiling material 60%

Heavy curtains 50%

Carpeting 20%

Wood 5%

Plaster 3%

Clay tile 3%

Concrete 2%

The answer is C. Heavy curtains

3is a crest4 is a trough 2 is the amplitude 1 is the wavelength

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