The Intensity Level of a "Super-Silent" Power Lawn Mower at a Distance

question 51

Multiple Choice

The intensity level of a "Super-Silent" power lawn mower at a distance of 1.0 m is 100 dB. You wake up one morning to find that four of your neighbors are all mowing their lawns using identical "Super-Silent" mowers. When they are each 20 m from your open bedroom window, what is the intensity level of the sound in your bedroom? You can neglect any absorption, reflection, or interference of the sound. The lowest detectable intensity is 1.0 × 10^-12 W/m².

• A) 80 dB
• B) 104 dB
• C) 400 dB
• D) 50 dB
• E) 40 dB

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Definitions:

Weighted-Average

A statistical method used to attribute different weights to data points or components based on their significance.

Cost Flow

Describes the manner in which costs move through a company's accounts, from the point of initial recording to their ultimate impact on financial statements.

Physical Flow

Physical flow pertains to the actual movement and processing of goods and materials through a production system or supply chain, often measured to assess efficiency and effectiveness.

Specific Invoice Method

A method used in accounting to record the cost of goods sold based on the specific cost of individual items.