An Enclosed Chamber with Sound Absorbing Walls Has a

question 8

Multiple Choice

An enclosed chamber with sound absorbing walls has a 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 .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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Definitions:

Income Tax Rate

The rate determining the tax payment on the income for individuals and corporations.

Salvage Value

The estimated residual value of an asset after it has reached the end of its useful life.

Working Capital

The gap between an enterprise's immediate assets and liabilities, showcasing the available liquidity for its daily activities.

Pretax Return

The income generated from an investment before the deduction of any taxes.