A spectroscopic instrument can resolve two nearby wavelengths λ and

1.	A spectroscopic instrument can resolve two nearby wavelengths λ and λ + Δλ if λ/Δλ is smaller than 8000. This is used to study the spectral lines of the Balmer series of hydrogen. Approximately how many lines will be resolved by the instrument ?
Answer» The range of Balmer series is 656.3 nm to 365 nm. It can resolve λ and λ + Δλ if λ/Δλ = 8000. No.of wavelengths in the range =656.3-365/8000=36 Total no.of lines 36 + 2 = 38 [extra two is for first and last wavelength]

A spectroscopic instrument can resolve two nearby wavelengths λ and λ + Δλ if λ/Δλ is smaller than 8000. This is used to study the spectral lines of the Balmer series of hydrogen. Approximately how many lines will be resolved by the instrument ?

Answer»

The range of Balmer series is 656.3 nm to 365 nm. It can resolve λ and λ + Δλ if λ/Δλ = 8000.

No.of wavelengths in the range =656.3-365/8000=36

Total no.of lines 36 + 2 = 38 [extra two is for first and last wavelength]