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Find the minimum energy a photon must have to create an electron-positron pair in the presence of a stationary nucleus of mass M.

Answer»

2mc^2(1+m/M)Explanation:We KNOW that mass of  STATIONARY nucleus is 2mc^2(1+m/M)Here C is the light speed and m mass of electron in restThe TOTAL energy in the system would be the sum of all rest energy and kinetic energy.It can be written as; ˙M=((2m+M)c^2+KE)^2The expression for the minimum energy a photon must have is given by, Now the minimum energy a photon should posses to create an electron positron pair, should be greater thanMinimum energy > 2mc^2(1+m/M)



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