Q.

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

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a

No line observed in Pfund 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.

answer is A, C, D, B.

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