If R is the Rydberg’s constant for hydrogen the wave number of the first line in the Lyman series will be

(a) R4                   (b) 3R4
(c) R2                   (d) 2R

(b) For Lyman series

v¯=1λ=R112-1n2  here n =2, 3, 4, 5......

For first line 

v¯=1λ=R112-122 v¯=R1-14=3R4

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