Let R1 be the radius of the second stationary orbit and R2 be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio ${{{R_1}} \over {{R_2}}}$ is :

Question

Let R₁ be the radius of the second stationary orbit and R₂ be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio ${{{R_1}} \over {{R_2}}}$ is :