Question

Example 14-8 depicts the following scenario. 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 6.86x106 W/m2 Now we will consider a slightly different scenario related to Example 14-8. ▼ Part A 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 descnbed in example 148 ad sill be able to hear it? Assume no reflections or absorption of the sparrow's sound Express your answer using three significant figures.

Answer 1

Relation between intensity and distance I_2/I_1 = r_2^2/r_1 [human can hear intensity more than 10^-12 w/m^2] (1.66)^2/r_2^2 = 106 - 12/6.86 times 10^-6 r_2 = squareroot (1.66)^2 (6.86 times 10^-6/10^-12) 4347.81 m = 4.3478 times 10^3 m