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

question 25

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.
-Use energy conservation to determine the rest energy of particle X.

• A)206 MeV
• B)249 MeV
• C)280 MeV
• D)392 MeV
• E)498 MeV

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