Practice question
Question
A bubble of radius 6mm is blown at 25cm depth in water (ρ\=1000kg/m3, S\=0.0727N/m). What is the total pressure inside? (Take Pa\=1.01×105Pa, g\=10m/s2)
Explanation
Pi = Pa+ρgh+2Sr. Pa = 1.01×105Pa, ρgh = 1000×10×0.25 = 2500Pa. 2Sr = 2×0.07276×10−3 = 24.23Pa. Pi = 1.01×105+2500+24.23 = 1.03524×105Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.035 × 10⁵ Pa. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.