What is the approximate change in densityof water in a lake at a depth of 400m below the surface ? The density of water at the surface is 1030 `kgm^(-3)` and bulk modulus of water is `2xx10^(9) Nm^(-2)`.
A. `4 kgm^(-3)`
B. `2 kgm^(-3)`
C. `6 kgm^(-3)`
D. `8 kgm^(-3)`