1. An electron of mass m and kinetic energy equal to its mass strikes apositron at rest. They annihilate, creating two high-energy photons. One photon entersa detector placed at an angle of 90° with respect to the direction of the incident electron.What is the value of 0 of the second photon?А. 22°EP.В. 30°С. 45°E.P.90aD. 60°E. P.BEFOREAFTER2. A moving radioactive particle ofmass 5m and kinetic energy T disintegrates into two par-ticles. One of the final particles has mass m and is atrest while the other final particle is massless and is inthe forward direction as shown in the figure. What is thethreshold/minimum kinetic energy T for this process toBEFORET, 5mAFTERосcur?А. бтВ. 8тm1 = mm2 = 0С. 12mD. 16m3. A proton of mass 938 [MeV] and energy 1069 [MeV] collides with anotherstationary proton. After the collision, the two protons form a composite particle with someenergy and momentum. Which of the following choices is the rest mass of the compositeparticle?A. 1002 (MeV]В. 1372 [МeV]C. 1416 (MeV]D. 1940 (MeV]

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