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.
Discussion
Comments
Share your thoughts. New comments appear after admin approval.
Please log in to join the discussion.
Login to commentNo comments yet. Be the first to start the discussion.