Question

What factors affect the amount of sound energy?

Answer 1

Density, compressibility, temperature, "regional" variations such a gradients or layered structure in these parameters, and air currents can bend and/or reflect sound waves. Additionally, complex and massive structures, such as trees can have a profound effect as acoustic absorbers. One can be standing in a dense forest, perhaps in Oregon or Virginia, etc., and find it so totally quiet that the sound of your own pulse becomes almost oppressive.

Answer 2

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