Question 125: Properties of Matter

Question

When two soap bubbles of radii a and b (b > a) coalesce, the radius of curvature of common surface is :

Accepted Answer

$${P_1} - {P_0} = {{4S} \over b}$$ ....(1)
$${P_2} - {P_0} - {{4S} \over a}$$ .....(2)
$${P_2} - {P_1} = {{4S} \over R}$$ ......(3)
eq(2) - eq(1) = eq(3)
$$ \Rightarrow $$ $${1 \over a} - {1 \over b} = {1 \over R}$$
$$ 	herefore $$ $$R = {{ab} \over {b - a}}$$

Answer

$${{b - a} \over {ab}}$$

Answer

$${{a + b} \over {ab}}$$

Answer

$${{ab} \over {a + b}}$$

Answer

$${{ab} \over {b - a}}$$

Properties of Matter

When two soap bubbles of radii a and b (b > a) coalesce, the radius of curvature of common surface is :

Choose the correct answer: