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What is the minimum energy that must be given to a H-atom in ground state so that it can emit an H?Line in Balmer series? If the angular momentum of the system is conserved, what would be the angular momentum of such H? photon?

0 2 Views | Posted 4 months ago
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    Answered by

    Vishal Baghel | Contributor-Level 10

    4 months ago

    This is a Short Answer Type Questions as classified in NCERT Exemplar

    Explanation- Hγ in Balmer series corresponds to transition n= 5 to n= 2. So, the electron in ground state i.e., from n= 1must first be placed in state n= 5.

    Energy required for the transition from n= 2 to n= 5 is given by E1-E5=13.6-0.54=13.06eV

    Since, angular momentum is conserved,

    angular momentum corresponding to Hg photon= change in angular momentum of electron

    so L5-L2=5h-2h= 3h = 3 × 1.06 × 10 - 34

    =3.18 × 10 - 34 kgm2/s

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