A Very Loud Train Whistle Has an Acoustic Power Output

question 30

Multiple Choice

A very loud train whistle has an acoustic power output of 80 W.If the sound energy spreads out spherically,what is the intensity level in dB at a distance of 100 meters from the train? (I₀ = 10−¹² W/m²)

• A) 78.3 dB
• B) 88.0 dB
• C) 92.8 dB
• D) 95.0 dB

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