Identify the correct statement (s) :

Options

A. Angular momentum of the electron is expressed an integral multiples of `(h)/(2pi)`
B. The first Bohr radius is `0.529^(@)`
C. The energy of the n-th level `E_(n)` is proportional to `(1)/(n^(2))`
D. The spacing between adjacent levesl increases with increase in 'n'