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

question 24

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:

Modus Tollens

A form of deductive argument in logic that, if the implication is true, then denies the consequent to conclude the denial of the antecedent.

Proposition

A declarative sentence that can be evaluated as true or false, conveying a statement or assertion.

Standard Form

In logic, the standard form refers to a way of structuring categorical propositions to clearly express their subject, predicate, and quantifier, facilitating easier analysis.

Hypothetical Syllogism

A form of logical reasoning that connects two conditional statements to arrive at a conclusion, typically structured as "If P, then Q; if Q, then R; thus, if P, then R."