First slide

Surface tension and surface energy

Question

A soap bubble in vacuum has a radius of 3 cm and another soap bubble in vacuum has a radius of 4 cm. If the two bubbles coalesce under isothermal condition, then the radius of the new bubble is

Moderate

A

2.3 cm
B

4.5 cm
C

5 cm
D

7 cm

Solution

$r = \sqrt{r_{1}^{2} + r_{2}^{2}} = \sqrt{9 + 16} = 5 cm$

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