What is the radius of the 4th orbit of `He^(+)`

Explanation

To find the radius of the 4th orbit of \( He^+ \) (helium ion), we can use the formula for the radius of the nth orbit in hydrogen-like species:

\[ R_n = \frac{0.53 \, n^2}{Z} \]

where:
- \( R_n \) is the radius of the nth orbit,
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