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Physics · PYQ NEET UG 2023
हिन्दीThe amount of energy required to form a soap bubble of radius \( 2\text{ cm} \) from a soap solution is nearly : (surface tension of soap solution \( = 0.03\text{ N m}^{-1} \))
Correct answer · Option B
\( 3.01 \times 10^{-4}\text{ J} \)
Explanation
Energy \( W = T \cdot \Delta A = T \times 2 \times (4\pi r^2) = 0.03 \times 2 \times 4 \times \pi \times (0.02)^2 \approx 3.01 \times 10^{-4}\text{ J} \).
