An electron makes a transition from orbit \( n=4 \) to the orbit \(...

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An electron makes a transition from orbit \( n=4 \) to the orbit \( n=2 \) of a hydrogen atom. The wave number of
\( \mathrm{P} \) the emitted radiations \( (R= \) Rydberg's constant) will be
W
(1) \( \frac{16}{3 R} \)
(2) \( \frac{2 R}{16} \)
(3) \( \frac{3 R}{16} \)
(4) \( \frac{4 R}{16} \)
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