First slide

Electromagnetic radiation and spectra

Question

In a sample of H-atoms electrons are de-excited from 4th excited state to ground state. Which is / are correct statement?

Moderate

A

No line observed in P-fund series.
B

Total ten lines observed in spectrum.
C

4 lines in UV-region and 3 lines in visible region observed.
D

One line observed in Brackett series.

Solution

$\begin{array}{l} 5 - 1 5 - 2 5 - 3 \underset{Brackett}{\underset{⏟}{5 - 4}} \\ 4 - 1 4 - 2 \underset{Paschen}{\underset{⏟}{4 - 3}} \\ 3 - 1 \underset{Balmer}{\underset{⏟}{3 - 2}} \\ \underset{Lyman}{\underset{⏟}{2 - 1}} \end{array}$

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