Atomic Structure - Result Question 50

####26. The energy of an electron in the first Bohr orbit of H-atom is 13.6eV. The possible energy value(s) of the excited state(s) for electrons in Bohr orbits of hydrogen is (are) (1998,2M)

(a) 3.4eV

(b) 4.2eV

(c) 6.8eV

(d) +6.8eV

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Solution:

  1. The energy of an electron in a Bohr atom is expressed as

En=kZ2n2 where, k= Constant  Z= Atomic number,  n= Orbit number  =13.6eV for H(n=1)

when n=2,E2=13.622eV=3.40eV

( n can have only integral value 1,2,3, )



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