- #1

Soaring Crane

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## Homework Statement

The howler monkey is the loudest land animal and can be heard up to a distance of 1.4 km. Assume the acoustic output of a howler to be uniform in all directions. The distance at which the intensity level of a howler's call is 49 dB, in SI units, is closest to:

a. 6.0---b.9.9----c. 8.4----d.7.5---e. 5.0

## Homework Equations

The only formula that I think is adequate in the inverse squares law in which:

I/I_o = r_2^2/r_1^2, where r is the distance and I is intensity in W/m^2

## The Attempt at a Solution

I only know of two values being given:

I = 49 dB = 0.4083 W/m^2

r_1 = 1.4 km

Is the third value I_o suggested anywhere in the problem? How do I use the above formula?

Thanks.

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