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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

Text Solution

Verified by Experts

The correct Answer is:
C
`r=sqrt(r_1^2+r_2^2)=sqrt(3^2+4^2)=5cm`
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