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Q.
The Bohr orbit radius for the hydrogen atom $(n=1)$ is approximately $0.530\,\mathring{A}$. The radius for the first excited state $(n=2)$ orbit is (in $\mathring{A}$ )
Radius of hydrogen atom $=0.530\,\mathring{A}$,
Number of excited state $(n)=2$ and atomic number of hydrogen atom $(Z)=1$.
We know that the Bohr radius.
$(r)=\frac{n^{2}}{Z} \times=\frac{(2)^{2}}{1} \times 0.530$
$=4 \times 0.530=2.12\,\mathring{A}$