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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) 16R              (b) 163R
(c) 165R              (d) 167R

(b) 1λ=R1n12-1n22=R122-142λ=163R

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