A bird-watcher is hoping to add the white-throated sparrow, Ask an Expert

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A bird-watcher is hoping to add the white-throated sparrow to her "life list" of species. Person, only 1.00 m from the bird, hears the sound with an intensity of 1.08 x 10^-5W/m².

How far could she be from the bird and still be able to hear it? Assume no reflections or absorption of the sparrow's sound.

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