b. the CMB photon propagates in the direction opposite the high-energy photon.c. Suppose the CMB photon propagates in the same direction as the high-energy photon. Is it everpossible for the two photons to collide and produce an electron-positron pair?Ifyouhaven't yet read the material in section 11.4.6, please do so before attempting this problem. High-energy photons propagating through space can convert into electron-positron pairs by scattering withcosmic microwave background (CMB) photons. Taking the average CMB temperature of 2.8 K, a typicalCMB photon will have an energy of roughly 7 x 10-4 eV. Calculate the minimum energy required for thehigh-energy photon to produce an electron-positron pair (me = 511 keV) ifa. the CMB photon momentum is perpendicular to that of the high-energy photon

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