A dog while barking delivers about 1 mW of power. If this power isuniformly distributed over a hemispherical area, what is the sound level at a distance of5 m? What would the sound level be if instead of 1dog 5 dog start barking at the same time delivering 1 mW of power?

Explanation

To solve the problem step by step, we will first calculate the sound level produced by one dog barking and then determine the sound level when five dogs bark simultaneously.

### Step 1: Calculate the intensity of sound produced by one dog at a distance of 5 m.

1. **Given Power**: The power delivered by one dog is \( P = 1 \, \text{mW} = 1 \times 10^{-3} \, \text{W} \).
2. **Area of a Hemisphere**: The area over which the power is distributed is the surface area of a hemisphere, which is given by:
\[
A = 2\pi r^2
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