The electron in a hydrogen atom makes transition from \( \mathrm{M}...

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The electron in a hydrogen atom makes transition from \( \mathrm{M} \) shell to \( \mathrm{L} \). The ratio of magnitudes of initial to final centripetal acceleration of the electron is
(A) \( 9: 4 \)
(B) \( 81: 16 \)
(C) \( 4: 9 \)
(D) \( 16: 81 \)
\( \mathrm{P} \)
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