An electron makes a transition from orbit n = 4 to the orbit n = 2 of a hydrogen atom. The wave number of the emitted radiations (R = Rydberg's constant) will be

(a) $\frac{16}{3\mathrm{R}}$          (b) $\frac{2\mathrm{R}}{16}$

(c) $\frac{3\mathrm{R}}{16}$          (d) $\frac{4\mathrm{R}}{16}$

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