The ratio of circumference of third and second P orbits of \( \math...

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The ratio of circumference of third and second
P orbits of \( \mathrm{He}^{+} \)ion is

W
(A) \( 3: 2 \)
(B) \( 2: 3 \)
(C) \( 9: 4 \)
(D) \( 4: 9 \)
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