The ratio of wavelengths of the last line of the Balmer series and the last line of the Lyman series is_____.

The ratio of wavelengths of the last line of the Balmer series and the last line of the Lyman series is_____.
  1. 2
  2. 1
  3. 4
  4. 0.5

Solution

For last Balmer series,
1λb=R 122-1∞2
λb=4R
For last Lyman series,
1λl=R 112-1∞2
λl=1R
λbλl=4R1R
λbλl=4

Hence this is the correct answer.

Asked in: NEET 2017

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