A soap bubble in vacuum has a radius of ...

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 conditions then the radius of the new bubble is :

A

2.3 cm

B

4.5cm

C

5 cm

D

7 cm

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The correct Answer is:

C

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