A convenient momentum unit for fundamental particle interactions is 1 MeV/e. Exp

Question

A convenient momentum unit for fundamental particle interactions is 1 MeV/e. Express this quantity of momentum in SI. When a single decay parent at rest decays into two particles, the total energy is conserved and the total momentum remains zero. Note that total energy is E_0 = m_0 c^2 where m_0 is the mass of the decay parent. Consider a hypothetical parent with a mass of 1 MeV/c^2 that decays to a lighter particle and a photon. If the photon has an energy of 200 keV, then what is the mass of the lighter particle?

Explanation / Answer

1) 1 MeV/c

= 1*10^6*1.6*10^-19 J /(3*10^8m/s)

= 5.33*10^-22 kg m/s answer

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