7-8: 4 SEE ANSWER

Answer: 6.65 seconds

Use the formula: A = d1s1 + d2s2 + d3s3...

Find the coefficients for the various surfaces using the table in the "Behavior of Sound" section of this unit : Walls = (0.07)X((2X28X2) + (2X15X8)) = 34 Sabians, Ceiling = (0.07)X(20X15) = 21 Sabians, and Floor = (0.01)X(20X15) = 3 Sabians

Plug the values into the formula: A = 32 + 21 + 3

Solve the problem: A = 58 Sabians

Now, find the velocity: v = 8 X 15 X 20 = 2400 m^2

Use the formula for reverberation time: Rt = (0.161V) / (A + (air)V)

Plug the values into the formula: Rt = (0.161 X 2400) / (58 + (0 X 2400))

Solve the problem: 6.65 seconds

1. REDIRECT 7-8 Assessment