Atomic Structure: Hard MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Question

The ratio of the kinetic energy of an electron in the 2nd Bohr orbit of He⁺ to that in the 3rd orbit of H is:

For a hydrogen-like species, $KE∝Z^2/n^2$ . The ratio is $(2^2/2^2)/(1^2/3^2)=1/(1/9)=<strong>9</strong>$ .