NEET 2019 Physics question
A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of N/m. The pressure inside the bubble equals at a point below the free surface of water in a container. Taking m/s, density of water kg/m, the value of is :
Answer: (3)
Solution
A soap bubble has two free surfaces, so the excess pressure inside it over the atmosphere is . The pressure at depth in water is . Equating,
= ρ g ⇒ = =
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