(II) What would be the wavelengths of the two photons produced when an electron and a positron, each with 420 keV of kinetic energy, annihilate in a head-on collision?

 What would be the wavelengths of the two photons produced when an electron and a positron, each

 

(II) What would be the wavelengths of the two photons produced when an electron and a positron, each with 420 keV of kinetic energy, annihilate in a head-on collision?

(II) In ordinary radioactive decay, a W particle may be created even though the decaying particle has less mass than the W particle. If you assume of the virtual W, what is the expected lifetime of the W?

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The mean lifetimes listed in are in terms of proper time, measured in a reference frame where the particle is at rest. If a tau lepton is created with a kinetic energy of 950 MeV, how long would its track be as measured in the lab, on average, ignoring any collisions?