# 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: