Two people relaxing on a deck listen to a songbird sing. one person, only 1.66 m from the bird, hears the sound with an intensity of 6.86×10−6 w/m2.
a bird-watcher is hoping to add the white-throated sparrow to her "life list" of species. how far could she be from the bird described in example 14-8 and still be able to hear it? assume no reflections or absorption of the sparrow's sound.
express your answer using three significant figures.