Solution to task 636 from Chertov´s for extramural stud

Solution to task 636 from Chertov´s for extramural stud

636. The wave function describing the motion of an electron in the ground state of the hydrogen atom has the form, where A is some constant; a0 is the first Bohr radius. Find the most probable distance of the electron from the nucleus for the ground state of the hydrogen atom.