The amount of energy required to form a soap bubble of radius 2 cm from a soap is nearly: (surface tension of soap = 0.03 N m⁻¹) (a) 5.06 × 10⁻⁴ J (b) 3.01 × 10⁻⁴ J (c) 50.1 × 10⁻⁴ J (d) 30.16 × 10⁻⁴ J

Answer: (b). Two surfaces: W = 8π r² T. W = 8 × 3.14 × (2×10⁻²)² × 0.03 W = 8 × 3.14 × 1.2×10⁻⁵ ≈ 3.01×10⁻⁴ J So the answer is (b) 3.01×10⁻⁴ J.

The amount of energy required to form a soap bubble of radius 2 cm… | NEET 2023

Q19NEET 2023Medium

Surface Energy & Work Done

The amount of energy required to form a soap bubble of radius $2\text{ cm}$ from a soap is nearly: (surface tension of soap $= 0.03\text{ N m}^{-1}$ )

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Answer: (b)

Two surfaces: $W = 8\pi r^2 T$ .
$W = 8 \times 3.14 \times (2\times10^{-2})^2 \times 0.03$
$W = 8 \times 3.14 \times 1.2\times10^{-5} \approx 3.01\times10^{-4}\text{ J}$
So the answer is (b) $3.01\times10^{-4}\text{ J}$ .

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