1.

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  [CBSE PMT 1995]

A.            \[\frac{16}{3R}\]      
B.            \[\frac{2R}{16}\]
C.            \[\frac{3R}{16}\]      
D.            \[\frac{4R}{16}\]
Answer» D.            \[\frac{4R}{16}\]


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