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. 12 cm
B. 16 cm
C. 25 cm
D. 5 cm

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1 Answers

Correct Answer - D
` r _(1) = sqrt(r_(1)^(2)+r_(1)^(2))`

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