The ratio of radius of first orbit in hydrogen to the radius of first orbit in deuterium will be...

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The ratio of radius of first orbit in hydrogen to the radius of first orbit in deuterium will be :-
(1) \( 1: 1 \)
(2) \( 1: 2 \)
(3) \( 2: 1 \)
(4) \( 4: 1 \)
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