Practice question
Question
A bubble of radius 3.5mm is blown at 15cm depth in water (ρ\=1000kg/m3, S\=0.0727N/m). What is the total pressure inside? (Take Pa\=1.01×105Pa, g\=9.8m/s2)
Explanation
Pi = Pa+ρgh+2Sr. Pa = 1.01×105Pa, ρgh = 1000×9.8×0.15 = 1470Pa. 2Sr = 2×0.07273.5×10−3 = 41.54Pa. Pi = 1.01×105+1470+41.54 = 1.02471×105Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.025 × 10⁵ Pa. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.