If `72 xx 10^(-5)` J of work is done to increase the radius of a soap bubble from 2 cm to 3 cm. What is the surface tension of the soap solution?

Explanation

To find the surface tension of the soap solution given the work done to increase the radius of a soap bubble, we can follow these steps:

### Step 1: Understand the Work Done
The work done (W) to increase the radius of the soap bubble is given as:
\[ W = 72 \times 10^{-5} \, \text{J} \]

### Step 2: Identify Initial and Final Radii
The initial radius (r1) and final radius (r2) of the soap bubble are given as:
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