Question

First line of Paschen series has wave number `(R_(H)=109700//cm)`
A. `2854xx10^(8)(Å)^(-1)`
B. `6243xx10^(8)(Å)^(-1)`
C. `6856xx10^(8)(Å)^(-1)`
D. `3452xx10^(8)(Å)^(-1)`

Answer 1

Correct Answer - C
`n_(l)=3 n_(f)=4`
`1/lambda=109677[1/n_(i)^(2)-1/n_(f)^(2)]=6856xx10^(8)(Å)^(-1)`