A soap bubble is blown from a radius of 1 cm to 2 cm. Calculate the work done in doing so, if the surface tension of the soap solution is 42 dyne/cm.

Explanation

To calculate the work done in blowing a soap bubble from a radius of 1 cm to 2 cm, we can follow these steps:

### Step 1: Understand the Concept of Work Done
The work done in increasing the size of a soap bubble is related to the change in surface area and the surface tension of the soap solution. The formula for work done (W) due to surface tension (T) is given by:
\[ W = T \times \Delta A \times 2 \]
where \( \Delta A \) is the change in surface area, and the factor of 2 accounts for the two surfaces of the soap bubble.

### Step 2: Calculate the Initial and Final Surface Areas
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