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In the 1930’s acoustic detection systems able to detect anaircraft at a range of 40.0 km were developed in several countries.The aircraft engines generate a sound intensity level of 95.0 dB ata distance of 10.0 metres from the aircraft, what intensity wouldbe present at the microphone in the detection system 40.0 km awayfrom the aircraft? You may assume that the aircraft is an isotropicsource of sound.

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