A Subatomic Particle X Spontaneously Decays into Two Particles, a and B

question 47

Multiple Choice

A subatomic particle X spontaneously decays into two particles, A and B, each of rest energy 1.40 × 10² MeV. The particles fly off in opposite directions, each with speed 0.827c relative to an inertial reference frame S.
-Which expression gives the momentum of particle A (relative to frame S) ?

• A)109 MeV/c
• B)140 MeV/c
• C)206 MeV/c
• D)249 MeV/c
• E)314 MeV/c

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