Bohr's atomic model is applicable for

The electric potential between a proton and an electron is given by V= V_(0) In((r)/(r_(0))) where r_(0) is a constant. Assume that Bohr atom model is applicable to potential, then variation of radius of n^(th) orbit r_(n) with the principal quantum number n is

In Bohr's atom model,

In Bohr's atom model,

If Bohr's model is applicable to an atom ._100X^256 then its orbital radius will be

Bohr's model is applicable to which ion?