Question

Hydrogen spectrum gave a series of lines at $\frac{5R}{36}$ , $\frac{3R}{16}$ and $\frac{21R}{100}$ cm(inverse) (R=Rydberg constant in cm(inverse)). These lines belong to which series?

Answer 1

Solve for the value of n1.
You will find that n1 = 2
Hence these lines belong to Balmer series.