The ratio of the radius of Bohr first orbit for the electron orbiting the hydrogen nucleus to th...

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The ratio of the radius of Bohr first orbit for the electron orbiting the hydrogen nucleus to that of the electron orbiting the deuterium nucleus (mass nearly twice that of \( \mathrm{H} \) nucleus) is approximately:
(a) \( 1: 1 \)
(b) \( 1: 2 \)
(c) \( 2: 1 \)
(d) \( 1: 4 \)
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