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1 Dec 2021
Given information
Given that an electron and a positron, each with 420 keV of kinetic energy, annihilate in a head-on collision and produce two photons. We are asked to find the wavelength of those photons.
Step-by-step explanation
Step 1.
The two photons produced will have a total momentum equal to zero, as the total momentum of the electron-positron pair is equal to zero. So, we can say that the total energy of the electron-positron pair is equal to that of the photons.
ie;
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