Radius of the second Bohr orbit of singly ionised helium atom is (1...

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Radius of the second Bohr orbit of singly ionised helium atom is
(1) \( 0.53 \AA \)
(2) \( 1.06 \AA \)
(3) \( 0.265 \AA \)
(4) \( 0.132 \AA \)
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