The diameter of an air-bubble formed at the bottom of a pond is `d=4mum`, when the bubble rises to the surface, its diameter increases `n=1.1` times. If expansion of air bubble is assumed to be isothermal and atmospheric pressure to be standard. How deep the pond at the spot is [surface tension of water `0.075(N)/(m)`]

Options

A. 2.5 m
B. 10 m
C. 7.5 m
D. 5 m

Answer

D

Explanation

`hrhog=P_(0)(n^(3)-1)+(4T(n^(2)-1))/(d)`