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The highest excited state that an electron in unexcited hydrogen atom can reach when they are bombarded with 12.2eV electron is:

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answer is 3.

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Detailed Solution

E1=−13.6eVAfter absorption of 12.2eV energyEH=−13.6+12.2=-1.4 eV Now En=E1n2 ∴ n2=−13.6−1.4=9.71∴ n=3

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