The excess pressure inside a soap bubble of radius 2 cm is 50 dyne/cm ². The surface tension is (a) 50 dyne/cm (b) 60 dyne/cm (c) 75 dyne/cm (d) 25 dyne/cm

Answer: (d). Soap bubble: Δ P = 4T/R ⇒ T = (Δ P · R)/(4). T = (50 × 2)/(4) = 25 dyne/cm So the answer is (d) 25 dyne/cm.

The excess pressure inside a soap bubble of radius 2 cm is 50 dyne/cm… | MHT CET 2022 (11 Aug, Shift 2)

Q39MHT CET 2022 · 11 AUG · SHIFT 2Easy

Excess Pressure: Drops & Bubbles

The excess pressure inside a soap bubble of radius $2\text{ cm}$ is 50 dyne/cm ${}^{2}$ . The surface tension is

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Answer: (d)

Soap bubble: $\Delta P = \frac{4T}{R} \Rightarrow T = \frac{\Delta P \cdot R}{4}$ .
$T = \frac{50 \times 2}{4} = 25$ dyne/cm
So the answer is (d) 25 dyne/cm.

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