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

Question 27

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.
-Determine the total energy of particle A.


A) 109 MeV
B) 140 MeV
C) 200 MeV
D) 249 MeV
E) 314 MeV

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