Question

For an electron in a hydrogen atom, the wave function is given by $\Psi_{1s} = \left( \pi/\sqrt{2} \right)e^{- r/a_{0}}$, where a_o is the radius of first Bohr’s orbit and r is the distance from the nucleus with which the probability of finding electron varies. What will be the ratio of probabilities of finding electrons at the nucleus to first Bohr’s orbit a_o?