An electron of mass m is initially moving with a constant speed v, where v<
(a) Determine the kinetic energy of the electron.
(b) Determine the de Broglie wavelength of the electron.
The electron encounters a particle with the same mass and opposite charge[a positron] moving with the same speed in the opposite direction. The two particles undergo a head on collision, which results in the disappearance of both particles and the production of two photons of the same energy.
(c) Determine the energy of each photon.
(d) Determine the wavelength of each photon.
(e) Explain why there must be two photons produced instead of just one.