A Sound Source Emits 20

question 23

Multiple Choice

A sound source emits 20.0 W of acoustical power spread equally in all directions.The threshold of hearing is 1.0 × 10^-12 W/m².What is the sound intensity level 30.0 m from the source?

• A)92.5 dB
• B)81.5 dB
• C)1.77 × 10^-3 dB
• D)1.77 × 10^-3 W
• E)-27.5 dB

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Definitions:

Accumulated Depreciation

The total amount of depreciation expense that has been recorded for an asset since it was put into use, reducing its carrying value on the balance sheet.

Commercial Substance

A concept in accounting indicating that a transaction significantly affects the economic situation of the involved parties through a change in cash flows or the value of assets and liabilities.

Trade-In Allowance

The credit a buyer receives for a previous item towards the purchase of a new item.

Accumulated Depreciation

The total amount of a tangible asset's cost that has been allocated as depreciation expense over its useful life.