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15. 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

(a)  2.3 cm                                       

(b)  4.5 cm

(c)   5 cm                                  

(d) 7 cm

Ans. c

(35)

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