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**Types of spectrum**

**Description**

Many questions from this topic are based on identification of the type of spectral lines and finding the value of n.

**How to approach**

While solving questions related to it, you should know about the series of lines in the hydrogen spectrum i.e, Lyman series, Balmer series, Paschen series, Brackett series, Pfund series. Apart from this, you should be aware of the expression that describes the series of lines:

$ν=109677(n_{1}1 −n_{2}1 )cm_{−1}$

where $n_{1}=1,2....$

$n_{2}=n_{1}+1,n_{1}+2...$

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