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A hydrogen like atom of atomic number Z is in an excited state of quantum number 2n. It can emit a maximum energy photon of 204 eV. If it makes a transition to
quantum state n, a photon of energy 40.8 eV is emitted. The value of n will be

a
1
b
2
c
4
d
3

detailed solution

Correct option is B

Let ground state energy (in eV) be E1Then from the given conditionE2n−E1=204eV  ⇒ E14n2−E1=204eV ⇒E114n2−1=204eV.......(i)  and   E2n−En=40.8eV ⇒E14n2−E1n2=E1−34n2=40.8eV........(ii)  From equations (i) and (ii),  1−14n234n2=5 ⇒n=2

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