Question: Q. 7. In the ground state of hydrogen atom, its Bohr radius is given as 5.3×1011 m. The atom is excited such that the radius becomes 21.2×1011 m. Find (i) the value of the principal quantum number and (ii) the total energy of the atom in this excited state.

A [OD South 2016]

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Solution:

Ans. (i)

r=r0n2

21.2×1011=5.3×1011n2

n=2

(ii)

E=13.6eVn2 =13.6eV22=3.4eV

[Award 1/2 mark if the student just writes E=E1/4]

[CBSE Marking Scheme 2016]



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