NEET 2019 Physics Surface Tension MCQ Question
A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10⁻² N/m. The pressure inside the bubble equals at a point Z₀ below the free surface of water in a container. Taking g = 10 m/s², density of water = 10³ kg/m³, the value of Z₀ is:
1 cm
0.5 cm
100 cm
10 cm
Correct Answer
Detailed Explanation
The pressure difference inside a bubble is given by 4T/r. Equating this to hydrostatic pressure ρgz gives Z₀ = 1 cm.
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