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Question 30953
JEE Physics · Hard

Fluid Mechanics: Surface Tension MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Surface TensionHardQuestion 30953

Question

Energy needed to blow a soap bubble of radius R (surface tension T) is:
  1. A
    2πR²T
  2. B
    4πR²T
  3. C
    8πR²T
    Correct
  4. D
    πR²T

Correct answer

8πR²T

Explanation

Soap bubble has two surfaces. Total surface area = 2 × 4πR² = 8πR². Energy = T × Area = 8πR²T.

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