A log of wood floats in water with 1/5th of its volume above the surface of water. The density of wood is :

Options

A. `0.8xx10^(3)kgm^(-3)`
B. `8xx10^(3)kgm^(-3)`
C. `0.08xx10^(3)kgm^(-3)`
D. `10^(3)kgm^(-3)`

Answer

A

Explanation

Here the wt. of the body = Wt. of water displaced by immersed portion of the body.
`Vxxpg=4/5V.d.g`
`p=4/5.d=0.8xx10^(3)kgm^(-3)`
Correct choice is (a).