What is the length of the minor axes in the L shell of hydrogen atom? 

Explanation

Bohr.s radius of L shell `= 0.529 xx 3Å :n = 2 and k = 1` for minor axes in 2 shell
Length of the major axes `= 2 xx 0.529 xx 2^(2)Å`. Ratio of lengths of the axes `=(n)/(2)=(2xx0.529xx2^(2))/(2)=2.16Å`
Length of minor axis`=(n)/(2)=(2xx0.529xx2^(2))/(2)=2.116Å`