The expression for the Bohr's radius of hydrogen like species is

Options

A. `n^(2)[(h^(2))/(4pi^(2)m(Ze^(2)//4pi in_(0)))]`
B. `(1)/(n^(2))[(h^(2))/(4pi^(2)m(Ze^(2)//4pi in_(0)))]`
C. `n^(2)[(4pi^(2)mh^(2))/((Ze^(2)//4pi in_(0)))]`
D. `(1)/(n^(2))[(4pi^(2)mh^(2))/((Ze^(2)//4pi in_(0)))]`

Answer

A