One requires 11eV of energy to dissociate a carbon monoxide molecules into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in

Here it is given, the energy required to dissociate a carbon monoxide molecule into carbon and oxygen atoms is  E=11eV. We know that E=hϑ where h=6.62×10−34Js  and ϑis frequency  ⇒11eV=hϑ ⇒ϑ=11×1.6×10−196.62×10−34=2.65×1015HzThis frequency radiation belongs to ultra violet region *** when energy of the given photon is in electron volt  then   wave length will  be given by λ=1243211=1130.18×10-10 m    this wavelength of the photon is in ultra violet region  because  E=hcλ   so λ=hcE =12432E   in  A0 .