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Electrons of energy 10.2 and 12.09 e Vat...

Electrons of energy `10.2 and 12.09 e Vatom"^(-1)` can cause radiations to be emitted from H atoms. Name the spectral line in the Balmer series. 

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`H_(alpha)` line
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If each hydrogen atom in the ground state, 1.0 inole of H atoms are excited by absrobing photons of energy 8.4 eV, 12.09 eV and 15.0 eV of energy, then the number of spectral lines emitted is equal to

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