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

question 43

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

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

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