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

question 43

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 kinetic energy of particle B (relative to frame S) .

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

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