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:

Direct Materials

Raw materials that are directly traceable to the manufacturing of a product and are significant in cost.

Sales Commissions

Fees paid to salespeople or brokers for facilitating or closing sales, usually calculated as a percentage of the sales value.

Direct Labor

The wages or costs associated with employees who directly contribute to the manufacture of a product or delivery of a service.

Direct Materials

Materials directly linked to the production of a product, representing a major part of the manufacturing cost.