Radius of H-atom in its ground state is 5.3 x 10^11 m. After collision – InterviewSolution

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1.	Radius of H-atom in its ground state is 5.3 x 10^11 m. After collision with an electron it is fouto have a radius of 21.2 × 10^-11m. What is theprincipal quantum no. 'n' of the final state of theatom:-
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