A muon and an antimuon are moving in opposite directions with velocities of -0.9 c and 0.9 c, respectively. When they collide, they can annihilate each other and turn into two photons. Both muon and antimuon have a mass of 105.66 MeV/c2.
1.) What is the total energy before the collision?
2.) What is the energy of each photon?
3.) What is the wavelength of each photon?