A yellow radiation having wavelength 5800 Å. The wavenumber (a) and frequency (b) of yellow radiation are respectively-
1. \(\mathrm{a   = 172.4   \times   10^{4}    ~ cm^{- 1} ,   b   =   5 . 172   \times   10^{14} ~  s^{- 1}}\)
2. \(\mathrm{a   =   5 . 172   \times   10^{14} ~  s^{- 1} ,   b   = 17.24   \times   10^{4}   ~  cm^{- 1}}\)
3. \( \mathrm{a   =   724   \times  10^{5}  ~   cm^{- 1} ,   b   =   5 . 172   \times   10^{15} ~  s^{- 1}}\)
4. \(\mathrm{a   = 1.72 4   \times   10^{4}   ~ cm^{- 1} ,   b   =   5 . 172   \times   10^{14} ~ s^{- 1}}\)