TS EAMCET · Physics · Mechanical Properties of Fluids
The work done in blowing a soap bubble of diameter 3 cm is (Surface tension of soap solution \(=0.035 \mathrm{Nm}^{-1}\) )
- A \(792 \mu \mathrm{~J}\)
- B \(99 \mu \mathrm{~J}\)
- C \(396 \mu \mathrm{~J}\)
- D \(198 \mu \mathrm{~J}\)
Answer & Solution
Correct Answer
(D) \(198 \mu \mathrm{~J}\)
Step-by-step Solution
Detailed explanation
\(W = T \times (2 \times 4\pi r^2) = T \times 2\pi D^2\) \(W = 0.035 \times 2\pi \times (0.03)^2\) \(W = 0.035 \times 2\pi \times 0.0009\) \(W = 0.0001979 \text{ J} \approx 198 \mu \text{J}\)
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