the energy of em radiation (or photon) is proportional to the frequency of the radiation. the em radiation (or photon) is composed of oscillating Electric and Magnetic fields. as such this energy must be stored in the oscillating electric and magnetic fields constituting the radiation. therefore the energy of the em radiation (or photon) must be related to the Magnitude of Electric and Magnetic fields associated with it.....(i.e. the Amplitude of the em field constituting it).....(because greater the magnitude of electromagnetic field , greater would be the energy stored in it and vice-versa). What is inappropriate here?