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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 ______.
Options
2.3 cm
4.5 cm
5 cm
7 cm
MCQ
Fill in the Blanks
Solution
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 5 cm.
Explanation:
r2 = `"r"_1^2+"r"_2^2`
= `sqrt(3^2+4^2)`
= 5 cm
shaalaa.com
First Law of Thermodynamics
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