The radius of the following orbits are double as that of the first Bohrs orbit of hydrogen atom....

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The radius of the following orbits are double as that of the first Bohrs orbit of hydrogen atom.
(a) \( \mathrm{He}^{+}(\mathrm{n}=2) \)
(b) \( \mathrm{Be}^{+3}(\mathrm{n}=2) \)
(c) \( \mathrm{O}^{+7}(\mathrm{n}=4) \)
(d) \( \mathrm{C}^{+5}(\mathrm{n}=3) \)
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