An electron changes its position from orbit n = 4 to the orbit n = 2 of an atom. The wavelength of the emitted radiation’s is (R = Rydberg’s constant)
(a) $\frac{16}{\mathrm{R}}$              (b) $\frac{16}{3\mathrm{R}}$
(c) $\frac{16}{5\mathrm{R}}$              (d) $\frac{16}{7\mathrm{R}}$

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