The frequency of light emitted for the transition

Question:

The frequency of light emitted for the transition $\mathrm{n}=4$ to $\mathrm{n}=2$ of $\mathrm{He}^{+}$is equal to the transition in $\mathrm{H}$ atom corresponding to which of the following

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

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

  3. $\mathrm{n}=3$ to $\mathrm{n}=2$

  4. $n=4$ to $n=3$

Correct Option: , 2

Solution:

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