If Bohr radius is represented by `a_(0)`, the radius of the second orbit of helium ion `(He^(+))` will be......

Explanation

To find the radius of the second orbit of the helium ion (He⁺), we can use the formula for the radius of an electron in a given orbit according to Bohr's model. The formula is:

\[ r_n = \frac{a_0 n^2}{Z} \]

Where:
- \( r_n \) is the radius of the nth orbit,
- \( a_0 \) is the Bohr radius,
- \( n \) is the principal quantum number (orbit number),
...