1. Tardigrade
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  3. Physics
  4. A sample of hydrogen gas in its ground state is irradiated with photons of 10.2 eV energies. The radiation from the above sample is used to irradiate two other samples of excited ionized He+ and excited ionized Li2 + , respectively. Both the ionized samples absorb the incident radiation. How many spectral lines are obtained in the spectra of Li2 + ?

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Q. A sample of hydrogen gas in its ground state is irradiated with photons of $10.2 \, eV$ energies. The radiation from the above sample is used to irradiate two other samples of excited ionized $He^{+}$ and excited ionized $Li^{2 +}$ , respectively. Both the ionized samples absorb the incident radiation. How many spectral lines are obtained in the spectra of $Li^{2 + ?}$

NTA AbhyasNTA Abhyas 2020Atoms

Solution:

$Li^{+ 2}$ is excited from $n=3$ to $n=6$
no of spectral lines
So, $N=\frac{n \left(n - 1\right)}{2}$
$N=15$