question_answer

A small hollow sphere, which has a small hole in it, is immersed in water to a depth of 0.5 m before any drop penetrates into it. If surface tension for water is 0.073 N/m, the radius of the hole is

A) 0.06 mm          

B) 0.03 mm      

C) 0.09 mm          

D) 0.15 mm.