NEET 2023, Physics Q21: Properties of Fluids

NEET2023Physics

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

A
$5.06 \times 1 0^{- 4}$ J
B
$3.01 \times 1 0^{- 4}$ J
C
$50.1 \times 1 0^{- 4}$ J
D
$30.16 \times 1 0^{- 4}$ J

Solution

A soap bubble has two surfaces (inner and outer), so the energy required is $E = T \times 2 \times 4 π R^{2} = 8 π T R^{2}$ .

$E = 8 π \times 0.03 \times (2 \times 1 0^{- 2})^{2} = 8 π \times 0.03 \times 4 \times 1 0^{- 4}$

$\approx 3.01 \times 1 0^{- 4}$ J.

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NEET 2023, Physics Q21: Properties of Fluids

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