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. carpet b. wood c. heavy curtains d. concrete

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

The student's breath contains carbon dioxide which the weed uses during photosynthesis, creating oxygen as a by-product of the process, thus increasing the volume of gas the pond weed makes.

Explanation:

Plants take in carbon dioxide during photosynthesis, creating oxygen as a by-product.