Nuclear sizes are expressed in a unit named

Options

A. Fermi
B. angstrom
C. newton
D. tesla

Explanation

Length of the diagonal = `sqrt(a^(2)+a^(2))=sqrt(2)a`
`therefore` The distance of vertices from the centre
`r=(asqrt(2))/(2)`
`therefore r=(a)/(sqrt(2))`
`therefore` The moment of inertia of this system about the axis passing through the centre of square
`I=mr^(2)+mr^(2)+mr^(2)+mr^(2)`
`=(4mxxa^(2))/(2)`
`therefore I=2ma^(2)`