Answered: As aids in conversions, note that 10 ft…

As aids in conversions, note that 10 ft = 3.05 m, 100 ft² 0.0002 μbar 10.8 ft². = 20 μPa, 1 ft² = = 9.29 m², 1000 ft³ = 28.3 m³, 1 metric sabin = 0.093 m², and 1 m² 1 English sabin =

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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Question

When steady-state conditions are reached in a live room, the sound pressure level is

74 dB re 20 muPa. (a) If the average absorptivity of the walls is 0.05, what is the rate

at which sound energy is being absorbed per square meter of wall surface? (b) If the

total area of absorbing surface in the room is 50 m^2, at what rate in watts is sound

energy being generated in the room?

As aids in conversions, note that 10 ft = 3.05 m, 100 ft²
0.0002 μbar
10.8 ft².
=
20 μPa, 1 ft²
=
=
9.29 m², 1000 ft³
=
28.3 m³,
1 metric sabin
=
0.093 m², and 1 m²
1 English sabin =

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