What is the ratio of radius of `K` orbit in `H` atom to the radius of `M`-orbit of `Li^(+2)`?

In an atom the ratio of radius of orbit of electron to the radius of nucleus is

The ratio of radius of second orbit of hydrogen to the radius of its first orbit is :

The ratio of radius of first orbit in hydrogen to the radius of first orbit in deuterium will be :

Calculate ratio of radius of 1 ^(st) orbit of H atom to Li ^(+2) ion :

The radius of first Bohr orbit in H-atom is 0.53 Å. The radius of third orbit is

Calculate the ratio of the radius of 1^(st) orbit of H atom to thatof 4^(th) orbit. Hint : r_(n) prop ( n)^(2)

The radius of an orbit in hydrogen atom is equal to

The radius of the first orbit of H-atom is r. then the radius of the first orbit of Li^(2+) will be: