The neutral pion 1p0 2 is an unstable particle produced in
Chapter 39, Problem 39.74(choose chapter or problem)
The neutral pion 1p0 2 is an unstable particle produced in high-energy particle collisions. Its mass is about 264 times that of the electron, and it exists for an average lifetime of 8.4 * 10-17 s before decaying into two gamma-ray photons. Using the relationship E = mc2 between rest mass and energy, find the uncertainty in the mass of the particle and express it as a fraction of the mass.
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