A spectroscopic instrument can resolve two nearby wavelengths λ and λ + Δλ if λ/Δλ is smaller than 8000.
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 ?
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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]
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