Question

If two soap bubbles of different radii are connected by a tube,
(a) air flows from bigger bubble to the smaller bubble till the sizes become equal
(b) air flows from bigger bubble to the smaller bubble till the sizes are interchanged
(c) air flows from the smaller bubble to the bigger
(d) there is no flow of air.

Answer 1

Answer:

a

Explanation:

big bubble is getting more pressure than that of smaller bubble when they join they they share it equally.

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Answer 2

If two soap bubbles of different radii are connected by a tube, air flows from the smaller bubble to the bigger.

Explanation:

• This because, a bubble has an inner pressure  $\rho+\left(\frac{4 s}{r}\right)$ where s is the surface tension of the soap liquid, ρ is the atmospheric pressure and r is the radius of the bubble.
• Also, tiny bubble has higher pressure compared to bigger bubble as smaller the bubble the smaller the radius is.  
• Hence, when two bubbles of different radii are connected by a tube, the air flows from smaller bubble to bigger bubble until all the tiny bubbles vanish.