Structure Of Atom Question 11
Question 11 - 2024 (30 Jan Shift 2)
Number of spectral lines obtained in $\mathrm{He}^{+}$spectra, when an electron makes transition from fifth excited state to first excited state will be
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Answer (10)
Solution
$5^{\text {th }}$ excited state $\Rightarrow \mathrm{n}_{1}=6$
$1^{\text {st }}$ excited state $\Rightarrow \mathrm{n}_{2}=2$
$\Delta \mathrm{n}=\mathrm{n}{1}-\mathrm{n}{2}=6-2=4$
Maximum number of spectral lines
$=\frac{\Delta \mathrm{n}(\Delta \mathrm{n}+1)}{2}=\frac{4(4+1)}{2}=10$
