Question

A room is 6 m long, 5 m wide, and 4 m tall. The walls, ceiling, and floor all initially have the same sound absorption coefficient (a 0.01). When all acoustic sources (machines) are active, the sound pressure level (SPL) measures 90 dB. However, to meet certain noise standards, the SPL has to be reduced to 80 dB by installing carpet on the floor. a) What should the carpet's sound absorption coefficient (ae) be? b) If the SPL must be reduced to 70 dB by installing acoustic tile on the ceiling, 5. what must the absorption coefficient O be? (Assume the carpet has been installed). Hints:1) convert the SPLs to pressures measured in pascals 2) assume the acoustic power sources (Ilm) remain constant (in all scenarios) and that direct and reverberant sound fields can be treated as one sound field, where nition of As, the area of the open window

Answer 1

Sound enugy abso ked by sulace total aured enuray ineidhnt on A I sundd enung inadent on inade n tuta o da 70 d 2 80 2 0.125