Question

An air bubble is formed in a liquid of surface tension $5 \times 10^{-2}\text{ Nm}^{-1}$. The decrease in the pressure inside the air bubble when its radius increases from 0.2 mm to 0.5 mm is}

• A. $450\text{ Nm}^{-2}$
• B. $150\text{ Nm}^{-2}$
• C. $600\text{ Nm}^{-2}$
• D. $300\text{ Nm}^{-2}$

Hint:

For an air bubble in a liquid: \[ P=\frac{2T}{r} \] For a soap bubble: \[ P=\frac{4T}{r} \] Always identify the type of bubble before applying the formula.

Answer 1

The Correct Option is A