+91-8076753736[email protected]
logo
logo
-->

Atoms

Question
CBSEENPH12040109
Wired Faculty App

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is

  • 2

  • 1

  • 4

  • 0.5

Solution

C.

4

For the last Balmer Series
1 over straight lambda subscript straight b space equals space straight R space open square brackets 1 over 2 squared minus 1 over infinity squared close square brackets straight lambda subscript straight b space equals space 4 over straight R For space last space layman space Series fraction numerator begin display style 1 end style over denominator begin display style straight lambda subscript 1 end style end fraction space equals space straight R space open square brackets fraction numerator begin display style 1 end style over denominator begin display style 1 squared end style end fraction minus fraction numerator begin display style 1 end style over denominator begin display style infinity squared end style end fraction close square brackets straight lambda subscript 1 space equals space 1 over straight R straight lambda subscript straight b over straight lambda subscript straight l space equals space fraction numerator begin display style 4 over straight R end style over denominator begin display style 1 over straight R end style end fraction straight lambda subscript straight b over straight lambda subscript straight l space equals space 4

Some More Questions From Atoms Chapter

J.J. Thomson's cathode ray tube experiment demonstrated- that

Total energy of an electron in hydrogen atoms above 0 eV leads to

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation