A copper bar of length `L` and area of cross section `A` is placed in a chamber at atmospheric pressure. If the chamber is evacuated, the percentage change in its volume will be (compressibility of copper is `8 xx 10^(-12) m^(2)//N` and `1 atm = 10^(5) N//m^(2))`

Options

A. `8xx10^(-7)`
B. `8xx10^(-5)`
C. `1.25xx10^(-4)`
D. `1.25xx10^(-5)`

Answer

B

Explanation

`K=(DeltaV//V)/(DeltaP)or(DeltaV)/(V)=DeltaP(K)`
Where K is the compressibility `rArr(DeltaV)/(V)xx100=10^(5)xx8xx10^(-12)xx100=8xx10^(-5)`