Constants The first antiparticle, the positron or antielectron, was discovered i
ID: 306163 • Letter: C
Question
Constants The first antiparticle, the positron or antielectron, was discovered in 1932. It had been predicted by Paul Dirac in 1928, though the nature of the prediction was not fully understcod until the experimental discovery. Today, it is well accepted that al fundamental particles have antiparticles. Correct Part C Suppose that an electron and a positron collide head-on. Both have kinetic energy of 3.58 MeV and rest energy of 0.511 MeV. They produce two photons, which by conservation of momentum must have equal energy and move in opposite directions. What is the energy Eloton of one of these photons? Express your answer in MeV to three significant figures Ephston 1.461 MeV Submit X Incorrect: Try Again; 5 attempts remaining Part D Complete previous parts)Explanation / Answer
by conservation of energy and momentum
two photons have equal energy and momentum
total enrgy of electrons or positrons
E = Ek+E0
E = 3.58+0.511
E = 4.091 MeV
according to law of conservation 0f energy
E+E = 2Ephoton
Ephoton = E = 4.091 MeV