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Inorganic Chemistry

when a hydrogen sample in ground state is bombarded then what potential is required to accelarate electron so that first paschen line is emitted:-
a.2.55 b.0.65 c.12.75

Profile image of Tanusri Bose
6 Years agoGrade
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1 Answer

Profile image of Arun
ApprovedApproved Tutor Answer6 Years ago
Dear student
 
The energy of electronic levels in hydrogen atom is determined by the equation:
En=-13.6/n2
, where n – the level number.
The first Paschen line corresponds the transition n=4 to n=3. Thus, the electron should be delivered to 
n=4 level. The potential required to do this equals:
E = E4-E1 = 13.6(1 – 1/16) eV = 12.75 eV

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