A certain dye absorbs light of certain wavelength and then fluorescence light of wavelength
5000 Å. Assuming that under given conditions, 50% of the absorbed energy is re-emitted out as
fluorescence and the ratio of number of quanta emitted out to the number of quanta absorbed is
5 : 8, find the wavelength of absorbed light (in Å) : [hc = 12400 eVÅ ]