Question

The wave number of first line of Balmer series of H-atom is 15200 cm−1. The wave number of first Balmer line of Li+2 ion is

Answer 1

Explanation:

Solution



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Correct option is

D

136800cm−1

As we know,

vˉ=λ1=RH×Z2[n121−n221]

For 1st line of Balmer series, n1=2;n2=3

vHˉ=λH1=RH×12[221−321]

For Li ion,

vLi2+ˉ=λLi2+1=RH×32[2