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A listener is 2m from a source of sound waves. If the listener moves to a distance of 20m, by how much will the sound level decrease?

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Interesting fact:

Here’s a cool one! Sunflowers’ spiral shapes follow a Fibonacci sequence (i.e., 1, 1, 2, 3, 5, 8…): each number is the sum of the previous two digits. This is how light is maximized for each of the flowers.