Radius of the second Bohr obit of singly ionised helium atom is (A)...

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Radius of the second Bohr obit of singly ionised helium atom is
(A) \( 0.53 \AA \)
(B) \( 1.06 \AA \)
(C) \( 0.265 \AA \)
(D) \( 0.132 \AA \)
\( \mathrm{P} \)
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