A point isotropic source with sonic power `P=0.10W` is located at the centre of round hollow cylinder with radius `R=1.0 m ` and height `h=2.0m`. Assuming the sound to be completely absorbed by the walls of the cylinder, find the mean energy flow reachind the lateral surface of the cylinder.

Explanation

To solve the problem, we need to find the mean energy flow reaching the lateral surface of the hollow cylinder from the point isotropic source. Here’s how we can approach this step by step:

### Step 1: Understand the setup
We have a point isotropic source of sound power \( P = 0.10 \, \text{W} \) located at the center of a hollow cylinder with radius \( R = 1.0 \, \text{m} \) and height \( h = 2.0 \, \text{m} \). The sound is completely absorbed by the walls of the cylinder.

### Step 2: Calculate the total surface area of the cylinder
The lateral surface area \( A \) of a cylinder is given by the formula:
\[
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