Which transition in the hydrogen spectrum would have the same wavelength as the Balmer type transition from $\mathrm{n=4}$ to $\mathrm{n}=2$ of $\mathrm{He}^{+}$ spectrum

Question

$\mathrm{n}=3$ to $\mathrm{n}=4$

$\mathrm{n}=2$ to $\mathrm{n}=1$

$\mathrm{n}=1$ to $\mathrm{n}=2$

$\mathrm{n}=1$ to $\mathrm{n}=3$

Solution

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