The ratio for the speed of the electron in the \( 3^{\text {rd }} \) orbit of \( \mathrm{He}^{+}...

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The ratio for the speed of the electron in the \( 3^{\text {rd }} \) orbit of \( \mathrm{He}^{+} \) to the speed of the electron in the \( 3^{\text {rd }} \) orbit of hydrogen atom will be :
(a) \( 1: 1 \)
(b) \( 1: 2 \)
(c) \( 4: 1 \)
(d) \( 2: 1 \)
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