The formula of energy related with Bohr's orbit in the hydrogen atom is shown below. En=−
13.6
n2
eV⋅⋅⋅⋅⋅⋅⋅(I) Radius of Bohr atom is calculated as. rn=0.529
n2
Z
A⋅⋅⋅⋅⋅⋅(II) For hydrogen atom, Z=1 rn=r1n2 It is given that rn=9r1 Therefore, 9r1=r1n2 n2=9 n=3 Therefore, the energy related with the orbit of radius of 9r1 is as follows: E9=−