An Enclosed Chamber with Sound Absorbing Walls Has a 2

question 3

Multiple Choice

An enclosed chamber with sound absorbing walls has a 2.0 m × 1.0 m opening for an outside window.A loudspeaker is located outdoors,84 m away and facing the window.The intensity level of the sound entering the window space from the loudspeaker is 56 dB.Assume the acoustic output of the loudspeaker is uniform in all directions and that acoustic energy incident upon the ground is completely absorbed and therefore is not reflected into the window.The threshold of hearing is 1.0 × 10^-12 W/m².The acoustic power output of the loudspeaker is closest to

• A)0.035 W.
• B)0.070 W.
• C)0.18 W.
• D)0.35 W.
• E)0.70 W.

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Discrimination

Unjust or prejudicial treatment of different categories of people or things, especially on the grounds of race, age, or sex.

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Regulations established by the national government that apply throughout the country, superseding state and local laws where there is conflict.

Equal Rights

The principle that all individuals are entitled to the same rights and legal protections, without discrimination on any grounds.

Discrimination

Unjust or prejudicial treatment of different categories of people, especially based on race, age, sex, or disability.