At one end of capillary tube of radius r and length l, there is a soap bubble of radius R. The bubble is connected to the atmosphere though ccapillary tube. After how long the radius of the bubble will be reduced to zero? Coefficient of viscosity of air in `eta`.

Explanation

To solve the problem of determining how long it will take for the radius of a soap bubble connected to a capillary tube to reduce to zero, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Excess Pressure in the Soap Bubble:**
The excess pressure inside a soap bubble is given by the formula:
\[
P = \frac{4\sigma}{R}
...