A foyer of a public building has dimensions 20 m x 15 m x 3 m. Absorption properties of various materials are provided in Table 2 for the octave band frequencies between 125 Hz and 4 kHz. The room has painted concrete walls and ceiling and carpeted flooring. Glass windows of overall size 2 m x 10 m are along one wall. Calculate the resulting average absorption coefficient at each frequency when no people are present. Table 2. Room Acoustic Absorption Properties Frequency (Hz) a carpet a painted concrete a glass 125 0.02 0.01 250 0.03 0.05 0.05 0.35 0.25 0.18 500 1000 2000 4000 0.3 0.5 0.1 0.06 0.07 0.09 0.08 0.12 0.07 0.04

A foyer of a public building has dimensions 20 m x 15 m x 3 m. Absorption properties of various materials are provided in Table 2 for the octave band frequencies between 125 Hz and 4 kHz. The room has painted concrete walls and ceiling and carpeted flooring. Glass windows of overall size 2 m x 10 m are along one wall. Calculate the resulting average absorption coefficient at each frequency when no people are present. Table 2. Room Acoustic Absorption Properties Frequency (Hz) a carpet a painted concrete a glass 125 0.02 0.01 250 0.03 0.05 0.05 0.35 0.25 0.18 500 1000 2000 4000 0.3 0.5 0.1 0.06 0.07 0.09 0.08 0.12 0.07 0.04

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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