Properties Of Solids And Liquids Question 315

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[MP PMT/PET 1998; JIPMER 2000]

Options:

A) 2.3 cm

B)4.5 cm

C) 5 cm

D)7 cm

Show Answer

Answer:

Correct Answer: C

Solution:

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



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