Example 14-8 depicts the following scenario. Two people relaxing on a deck liste

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 2.69×10?5 W/m2.

Now we will consider a slightly different scenario related to Example 14-8.

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.

r= ______ km

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 2.69x10- 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 described in example 14-8 and still be able to hear it? Assume no reflections or absorption of the sparrow's sound.

Explanation / Answer

human can hear intensity more than 10^-12 W/m^2 .

and P = I (4 pi r^2)

I r^2 = constant

(2.69 x 10^-5)(1.66^2) = (10^-12) r^2

r = 8464 m .......Ans

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