where P is power and A is area.
The area from the source of sount is spherical.
A = 4πr2
A harvest mouse can detect sounds as quiet as -10 dB. Suppose you are sitting in a field on a very quiet day while a harvest mouse sits nearby at the entrance to its nest, a very gentle breeze causes a leaf 1.5 m from your head to rustle, generating a faint sound right at your ability to hear it. The sound of the rustling leaf is also right at the threshold of the mouse. How far is the harvest mouse from the leaf?
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