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

A soap bubble in vacuum has a radius of 3 cm ad 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

A

2.3 cm

B

4.5 cm

C

5 cm

D

7 cm

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The correct Answer is:

C

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