Using known values for hydrogen atom, calculate speed of electron in fourth orbit of `He^(+)`

Explanation

To calculate the speed of the electron in the fourth orbit of the helium ion \( He^+ \), we can use the formula for the velocity of an electron in the nth orbit of an atom:

\[ v_n = \frac{z}{n} v_1 \]

Where:
- \( v_n \) is the speed of the electron in the nth orbit.
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