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MHT CET202016 Oct 2020Evening ShiftPhysicsMechanical Properties of FluidsActual

The work done in blowing a soap bubble of radius 'R' is ' W '. The work done in blowing a bubble of radius ' 2 R ^ of the same soap solution is

Options

  1. Aw 4
  2. Bw 2
  3. C4w
  4. D2w

Correct answer

C. 4w

Step-by-step solution

(B) W ₁=8 R ² ~T where T is surface tension. If radius is doubled and surface tension remains same then W ₂=8 (2 R )² ~T =8 R ² ~T =4 ~W ₁ However, the solution is heated, the value of surface tension decreases. Hence, W ₂ < 4 ~W ₁

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