4. An clectron moving to the right at 0.9c collides with a positron moving to the left with a velocity of 0.9c. The two particles annihilate and produce two gamma-ray photons. What is the wavelength of the photons?
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A: Kp'= 1950 - [55.35 + 938] - 938 Kp' = 1950 - [993.35] -938 Kp' = 1950 - 1931.35 Kp'= 18.65 Mev
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