Calculate how far from the siren a person with a threshold, Physics

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Calculate how far from the siren a person with a threshold

The sound level from a siren emitting sound with a frequency of 2300 Hz is 70.0 dB at a distance of 40.0 m from the siren. Assume that the intensity of that sound obeys the inverse square law. Calculate how far from the siren a person, with a threshold of hearing of 25.0 dB at that frequency, can be located to barely be able to hear the sound from that siren.

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